PLEASE HELP ME WITH STUDYISLAND!!!

Answer:

81

Step-by-step explanation:

We have to solve the following multiplication: (−27) (5−8)

First, we are going to simplify the second parenthesis, before performing the multiplication:

(−27) (5−8) = (−27)(-3) = 81.

The result is positive given that minus times minus equals plus.

Step 1: Solve the second parentheses

( − 2 7 ) ( 5 − 8 )

5 - 8 = -3

(-27)(-3)

Step 2: Multiply -27 by -3. Since these are both negative the answer will be positive

-27 * -3 = 81

Hope this helped!

~Just a girl in love with Shawn Mendes

Answer:

z = 6

Step-by-step explanation:

Given

6z + 10z = 96 ← collect terms on left side

16z = 96 ( divide both sides by 16 )

z = 6

Answer:

2

Step-by-step explanation:

3 * -2 = -6

-6 +5 = 1

-2 * -1 = 2

the value would be two

Answer: [tex]a=\sqrt{c^2-4}[/tex]

Step-by-step explanation:

You know that the Pythagorean Theorem is:

[tex]a^2+b^2=c^2[/tex]

Where "a" and "b" are the legs and "c" is the hypotenuse.

Then, since you need to find  the length of side "a" in terms of the hypotenuse "c", you need to solve for "a":

Subtract b² from both sides of the equation:

[tex]a^2+b^2-b^2=c^2-b^2[/tex]

[tex]a^2=c^2-b^2[/tex]

And finally, you need to apply square root to both sides of the equation:

[tex]\sqrt{a^2}=\sqrt{c^2-b^2}\\\\a=\sqrt{c^2-b^2}[/tex]

Then:

[tex]a=\sqrt{c^2-2^2}\\\\a=\sqrt{c^2-4}[/tex]

Answer:

Final answer is [tex]a=\sqrt{c^2-4}[/tex].

Step-by-step explanation:

Given that b=2. Now using Pythagorean theorem, we need to find the value of a in terms of c.

So let's plug b=2 into formula :

[tex]a^2+b^2=c^2[/tex]

[tex]a^2+2^2=c^2[/tex]

[tex]a^2+4=c^2[/tex]

[tex]a^2=c^2-4[/tex]

Take square root of both sides and use principle root as side length can't be negative.

[tex]a=\sqrt{c^2-4}[/tex]

Hence final answer is [tex]a=\sqrt{c^2-4}[/tex].

Answer:

The angle of elevation is 60.3°

Step-by-step explanation:

* Lets revise the trigonometry functions

- In any right angle triangle:

# The side opposite to the right angle is called the hypotenuse

# The other two sides are called the legs of the right angle

* If the name of the triangle is ABC, where B is the right angle

∴ The hypotenuse is AC

∴ AB and BC are the legs of the right angle

- ∠A and ∠C are two acute angles

- For angle A

# sin(A) = opposite/hypotenuse

∵ The opposite to ∠A is BC

∵ The hypotenuse is AC

∴ sin(A) = BC/AC

# cos(A) = adjacent/hypotenuse

∵ The adjacent to ∠A is AB

∵ The hypotenuse is AC

∴ cos(A) = AB/AC  

# tan(A) = opposite/adjacent

∵ The opposite to ∠A is BC

∵ The adjacent to ∠A is AB

∴ tan(A) = BC/AB

* Now lets solve the problem

∵ The shadow of the tree is 20 feet long

- The shadow of the tree is on the ground

∵ The height of the tree is 35 feet tall

∴ The shadow of the tree and the height of the tree formed the legs of

  a right triangle

- The angle of elevation is opposite to the tree

∴ The shadow of the tree is the adjacent side of the angle of elevation

∴ The height of the tree is the opposite side of the angle of elevation

- let the name of the angle of elevation is Ф

∴ tan Ф = tree height/shadow length

∴ tan Ф = 35/20 = 7/4

∴ Ф = tan^-1(7/4) = 60.3°

* The angle of elevation is 60.3°

The correct interpretation for the expression 5(3x - 4)² is The product of 5 and the square of 3x - 4 ( option C)

An expression is a mathematical phrase containing variables, constants, and operators.

It represents a mathematical relationship or computation and does not have a specific value until the variables are assigned values.

Interpreting 5(3x - 4)²

is The product of 5 and the square of 3x - 4

Therefore, the correct interpretation for the expression 5(3x - 4)² is The product of 5 and the square of 3x - 4

Given : Radius of cylinder = 8 m

Height = 4 m

Volume of cylinder = πr²h cu. units

= 22/7 × 8 × 8 × 4 m³

= 804.57 m³ (approx.)

Curved surface area = 2πrh sq. units

= 2 × 22/7 × 8 × 4 m²

= 201.14 m² (approx.)

Total surface area = 2πr(r + h) sq. units

= 2 × 22/7 × 8 (8 + 4) m²

= 2 × 22/7 × 8 × 12 m²

= 603.43 (approx.)

Final answer:

The volume of a cylinder with a radius of 8 meters and a height of 4 meters is calculated using the formula V = πr²h, which yields approximately 804.25 cubic meters when using π ≈ 3.14159.

Explanation:

To calculate the volume of a cylinder with a given radius and height, you can use the formula V = πr²h. In the case of a cylinder with a radius of 8 meters and a height of 4 meters, plug these values into the formula to get:

V = π × (8 m)² × 4 m

V = π × 64 m² × 4 m

V = 256π m³

Since π (pi) is approximately 3.14159, you can further calculate the volume as:

V ≈ 256 × 3.14159 m³

V ≈ 804.2477 m³

Thus, the volume of the cylinder is approximately 804.25 cubic meters, when expressed with four significant figures.

Answer:

(-4,-3)

Step-by-step explanation:

we know that

The distance OB is equal to

(8-4)=4 units

To find the new distance OB', multiply the distance OB by the scale factor

so

OB'=OB*3

OB'=4*3=12 units

The x-coordinate of point B' is equal to

8-12=-4

The y-coordinate of point B' is the same that B  -3

the coordinates of point B'are (-4,-3)

Answer:

[tex]\large\boxed{V=81\pi\ in^3}[/tex]

Step-by-step explanation:

The formula of a volume of a cylinder:

[tex]V=\pi r^2H[/tex]

r - radius

H - height

We have r = 3in and H = 9in. Substitue:

[tex]V=\pi(3^2)(9)=\pi(9)(9)=81\pi\ in^3[/tex]

Answer: 37.5

Step-by-step explanation:

15 15 3

___ = ___ = ___ = 0.375 = 37.5

15+25 40 8

By substituting p = 10 into the equation -p + 60 = h + 10,000 and solving for h, we find that the constant h is -9,950.

The solution cam be solved as:

To find the value of constant h when p = 10 is a solution to the equation -p + 60 = h + 10,000, we substitute p = 10 into the equation and solve for h.

-p + 60 = h + 10,000

-10 + 60 = h + 10,000

50 = h + 10,000

h = 50 - 10,000

h = -9,950

The value of h is therefore -9,950.

The equation to calculate the sale price of the skirt, which is 's', given an original price 'p' and a discount of 20% on the original price would be s = p - (0.2 * p). This equation essentially subtracts the discount amount (20% of 'p') from 'p' to get the sale price 's'.

To calculating a sale price, which is a Mathematical exercise commonly carried out in financial and business scenarios. In this context, there's a 20% sale on skirts. Given that the original price of the skirt is 'p', and the discount is 20% of 'p', we can denote that as '0.2p'. If the sale price is represented as 's', the equation to calculate the sale price would be s = p - (0.2 * p). This equation essentially subtracts the discount amount (20% of the original price) from the original price to obtain the price after discount, which is the sale price.

Learn more about Price Calculation here:

https://brainly.com/question/38012507

#SPJ2

the equation s = 0.80 * p. This accounts for a 20% reduction from the original price.

We need to determine the sale price using the original price (p) and the discount rate (20%).

Since the discount is 20% off, you can convert this percentage to a decimal
20% = 0.20.

To find the amount discounted, multiply the original price by 0.20,
Discount Amount = 0.20 * p.

Subtract the discount amount from the original price to get the sale price,
Sale Price (s) = p - 0.20 * p.

Alternatively, you can factor out p in the equation: s = p (1 - 0.20),
which simplifies to s = 0.80 * p.

Answer:

1024

Step-by-step explanation:

There are 4 bacteria at the start. We can make an equation to represent the phenomena explained in the question.

As it is written in the question that the bacteria culture doubles in every hour.

So,

Let t represent the unit of time

So the number of bacteria after t unit of time will be  

Number of bacteria after t unit of time=4*2^t

We have to calculate number of bacteria after 8 hours, so t = 8

Number of bacteria after 8 hours=4*2^8

=4*256

=1024

So the bacteria after 8 hours in the culture will be 1024..

The initial population of the bacterium cells was 4, and after 8 hours, there would be 1024 bacteria in the culture.

The initial population of the bacterium cells at the beginning of the experiment was 4 bacteria.

Step-by-step calculation:

Answer:

The measure of these two angles are 80° and 100°

Step-by-step explanation:

Let

x and y ----> the measure of the same side angles

we know that

The sum of of the same side angles of two parallel lines is equal to 180 degrees

x+y=180° -----> equation A

x=y-20° ----> equation B

substitute equation B in equation A and solve for y

(y-20°)+y=180°

2y=180°+20°

y=200°/2

y=100°

Find the value of x

x=100°-20°=80°

Answer:

D) 3/25

Step-by-step explanation:

(3/5)/5 = .12

3/23 = .12

Hello There!

Your answer would be 3/25. Whenever you have two probabilities together you can multiply them and in this case, multiplying 3/5 by 1/5 will get you a product of 3/25

That would be on the 5th week. There were 18 students that attended (D.)

Hope this helped!

Answer: It is 18

Step-by-step explanation: Hope this helps :D

Answer:

The value of y is 64 ⇒ first answer

Step-by-step explanation:

* Lets study the figure to solve the question

- The figure is a polygon of 5 sides

- It has five interior angles and five exterior angles

- The sum of its interior angles depends on the number of its sides

- We can find the sum of the measures of its interior angles from this

 rule ⇒ the sum = (n - 2) × 180°, where n is the number of its sides

- The sum of the measures of its exterior angles is 360°

 (fixed for any polygon)

- The sum of the measure of an interior angle and its exterior angle

  is 180°

∵ m∠A = m∠B

∴ The exterior angle of ∠A = the exterior angle of ∠B

∵ The exterior angle of ∠B is y°

∴ The exterior angle of ∠A is y°

∵ The measure of the interior angle of the exterior angle x° is 90°

∴ 90° + x° = 180° ⇒ subtract 90 from both sides

∴ x° = 90°

∵ The polygon has five exterior angles

# Angle of measure 75 , angle of measure 67 , y° , y° , x°

∴ 75° + 67° + y° + y° + x° = 360° ⇒ sum of the exterior angles

∵ x° = 90°

∴ 75° + 67° + y° + y° + 90° = 360° ⇒ simplify

∴ 232 + 2y° = 360° ⇒ subtract 232 from both sides

∴ 2y° = 128 ⇒ divide both sides by 2

∴ y° = 64°

* The value of y is 64

Answer:

The correct answer is option A. 64

Step-by-step explanation:

From the figure we can see a pentagon.

Sum of angles of a pentagon is 540

To find the value of m<B

From the figure we get, Angle A and angle B are congruent

m<A = m<B  and one angle is 90°

Other two angles are,

180 - 75 = 105° and 180 - 67 = 113°

Also we can write,

105 + 113 + 90 + m<A + m<B = 540

308 + m<A + m<B = 540

m<A + m<B = 540 - 308 = 232

2m<B = 232

m<B = 232/2 = 116

To find the value of y

From figure we get,

<B + y = 180

y = 180 - <B

= 180 - 116 = 64

Therefore the correct answer is option A. 64

Step-by-step explanation:

[tex]\text{Use}\ (a+b)^3=a^3+3a^2b+3ab^2+b^3.\\\\\text{We have}\ (2x+y)^3\\\\=(2x)^3+3(2x)^2(y)+3(2x)(y^2)+y^3\\\\\text{The coefficient of}\ y^2\ \text{is}\ (3)(2)=6[/tex]

For this case we have that by definition, the surface area of a cylinder is given by:

[tex]SA = 2 \pi * r * h + 2 \pi * r ^ 2[/tex]

Where:

r: It's the radio

h: It's the height

Substituting according to the data we have:

[tex]SA = 2 \pi * (38) * (51) +2 \pi * (38) ^ 2\\SA = 2 \pi * 1938 + 2 \pi * 1444\\SA = 3876 \pi + 2888 \pi\\SA = 6764 \pi[/tex]

Thus, the surface area of the cylinder is [tex]6764 \pi \ mm ^ 2[/tex]

Answer:

[tex]6764 \pi \ mm ^ 2[/tex]

Answer:

(a) Rectangle 1 and rectangle 2 are similar

(b) The perimeter of Rectangle 2 is k times the perimeter of Rectangle 1

(c) The area of Rectangle 2 is k² times the area of Rectangle 1

Step-by-step explanation:

* Lets talk about the similarity

- Two rectangles are similar if there is a constant ratio between

  their corresponding sides

- Rectangle 1 has dimensions x and y

- Rectangle 2 has dimensions kx and ky

- The ratio between their dimensions is:

 kx/x = k and ky/y = k, so there is a constant ratio K between their

 corresponding dimensions

(a) Rectangle 1 and rectangle 2 are similar

- The perimeter of any rectangle is 2(the sum of its two dimensions)

∵ Rectangle 1 has dimensions x and y

∴ Its perimeter = 2(x + y) = 2x + 2y ⇒ (1)

∵ Rectangle 2 has dimensions kx and ky

∴ Its perimeter = 2(kx + ky) = 2kx + 2ky

- By taking k as a common factor

∴ Its perimeter = k(2x + 2y) ⇒ (2)

- From (1) and (2)

∵ The perimeter of rectangle 1 = (2x + 2y)

∵ The perimeter of rectangle 2 = k(2x + 2y)

∴ The perimeter of rectangle 2 is k times the perimeter of rectangle 1

(b) The perimeter of Rectangle 2 is k times the perimeter of Rectangle 1

- The area of any rectangle is the product of its two dimensions

∵ Rectangle 1 has dimensions x and y

∴ Its area = x × y = xy ⇒ (1)

∵ Rectangle 2 has dimensions kx and ky

∴ Its area = kx × ky = k²xy ⇒ (2)

- From (1) and (2)

∵ The area of rectangle 1 = xy

∵ The area of rectangle 2 = k²xy

∴ The area of rectangle 2 is k² times the area of rectangle 1

(c) The area of Rectangle 2 is k² times the area of Rectangle 1

(a) Yes, Rectangle 1 and Rectangle 2 are similar. (b) It is proved that the perimeter of Rectangle 2 is k times the perimeter of Rectangle 1. (c) It is proved that the area of Rectangle 2 is [tex]k^2[/tex] times the area of Rectangle 1.

(a) Yes, Rectangle 1 and Rectangle 2 are similar. They are similar because each dimension of Rectangle 2 is k times the corresponding dimension of Rectangle 1, which means that all angles remain the same and the sides are in proportion.

(b) To prove that the perimeter of Rectangle 2 is k times the perimeter of Rectangle 1, we start by noting that the perimeter of a rectangle is the sum of all its sides. For Rectangle 1, the perimeter [tex]P_1[/tex] is given by :

[tex]P_1 = 2(x + y)[/tex]

For Rectangle 2, each dimension is multiplied by k, so the length becomes kx and the width becomes ky. Therefore, the perimeter [tex]P_2[/tex] of Rectangle 2 is:

[tex]P_2 = 2( kx + ky)[/tex]

[tex]P_2 = 2k(x + y)[/tex]

Since 2(x + y) is the perimeter of Rectangle 1, we can replace it with [tex]P_1[/tex], yielding [tex]P_2 =[/tex] [tex]kP1[/tex] . This shows that the perimeter of Rectangle 2 is indeed k times the perimeter of Rectangle 1.

(c) To prove that the area of Rectangle 2 is [tex]k^2[/tex] times the area of Rectangle 1, we consider the formula for the area of a rectangle, which is the product of its length and width.

The area [tex]A_1[/tex] of Rectangle 1 is:

[tex]A_1 = xy[/tex]

For Rectangle 2, the length and width are both multiplied by k, so the area [tex]A_2[/tex] is:

[tex]A_2 = (kx)(ky)[/tex]

When we multiply these out,

we get:

[tex]A2 =[/tex] [tex]k^2xy[/tex]

Since xy is the area of Rectangle 1, we can replace it with [tex]A_1[/tex], giving us [tex]A_2 =[/tex] [tex]k^2A_1[/tex] . This demonstrates that the area of Rectangle 2 is [tex]k^2[/tex] times the area of Rectangle 1.

The diagram of rectangles:

m=10 as p=2m and k=2p=4m

Answer:

10

Step-by-step explanation:

Answer:

the equation to find the height is: x = 25 * tan(30°) and the height is x = 14.43 feet

Step-by-step explanation:

Length  of tree = 25 feet

Angle of elevation = 30 degrees

Equation for the height of tree=?

Let x represent the height.

We know that tan Ф = Perpendicular/Base

tan Ф = height of tree/ length of base

tan Ф = x/l

=> x = l*(tanФ)

x = 25 * tan(30°)

Now, putting values:

x= 25 * tan(30°)

x = 25 * 0.577

x = 14.43 feet

So, the equation to find the height is: x = 25 * tan(30°) and the height is x = 14.43 feet

The value of (f+g)(2) is 20.

The expression (f+g)(2) represents the sum of the functions f(x) and g(x) evaluated at x = 2.

To find the value of (f+g)(2), we need to first find the values of f(2) and g(2), and then add them together.

Given that f(x) = 3x^2 - 2 and g(x) = 4x + 2, we can find the values of f(2) and g(2) as follows:

1. Substitute x = 2 into f(x):
f(2) = 3(2)^2 - 2
= 3(4) - 2
= 12 - 2
= 10

2. Substitute x = 2 into g(x):
g(2) = 4(2) + 2
= 8 + 2
= 10

Now, we can find the value of (f+g)(2) by adding f(2) and g(2):

(f+g)(2) = f(2) + g(2)
= 10 + 10
= 20

Therefore, the value of (f+g)(2) is 20.

Answer:

m = 11/5, n= -57/5

Step-by-step explanation:

3m-n=18 and 2m+n=-7

Solve one of the equations for n

2m +n = -7

Subtract 2m from each side

2m-2m +n = -7 -2m

n = -7-2m

Substitute this into the first equation

3m -n =18

3m - (-7-2m) = 18

Distribute the minus sign

3m +7+2m = 18

Combine like terms

5m +7 = 18

Subtract 7 from each side

5m+7-7 = 18-7

5m = 11

Divide by 5

m = 11/5

Substitue this back into the equation for n

n = -7-2m

   =-7 -2(11/5)

   =-7-22/5

   -35/5 -22/5

  =-57/5

To solve the system using substitution, solve the first equation for n, substitute it into the second, and solve for m, which gives m = 11/5. Then, substitute m back into the expression for n to get n = -57/5.

To solve the system of equations using the substitution method, you can solve one of the equations for one variable and then substitute that expression into the other equation. Let's start with the two given equations:

3m - n = 18

2m + n = -7

First, solve the first equation for n:

n = 3m - 18

Now substitute this expression for n into the second equation:

2m + (3m - 18) = -7

Combine like terms:

5m - 18 = -7

Add 18 to both sides:

5m = 11

Divide by 5:

m = 11/5

Next, substitute the value of m back into the expression for n:

n = 3(11/5) - 18

n = 33/5 - 90/5

n = -57/5

Therefore, the solution to the system using the substitution method is m = 11/5 and n = -57/5.

1.Change them all to having common denominators so it’s easier to compare the numerators

1/3=35/105 *35

2/5=42/105 *21

4/7=60/105 *15

2.Compare and order

3. Answer from smallest to largest =

1/3,2/5,4/7

Hope this helps :)

Answer:

A) x=5 or -11

Step-by-step explanation:

The given equation is:

[tex](x+3)^2=64[/tex]

The most suitable method so solve this quadratic equation is the square root method.

We take square root of both sides to obtain:

[tex]x+3=\pm \sqrt{64}[/tex]

[tex]\implies x+3=\pm8[/tex]

[tex]\implies x=-3\pm8[/tex]

We now split the plus or minus sign to get;

[tex]x=-3-8\:,x=-3+8[/tex]

This simplifies to:

[tex]x=-11\:,x=5[/tex]

The correct choice is A

Answer:

X=3.5

Step-by-step explanation:

Answer:

B) 2 hours 20 minutes

Answer:B 2HRS 20MINS

Step-by-step explanation:

Step-by-step explanation:

The formula of a perimeter of a rectangle:

[tex]P=2l+2w[/tex]

We have P = 28. Substitute:

[tex]28=2l+2w[/tex]

Solve for w:

[tex]2l+2w=28[/tex]             subtract 2l from both sides

[tex]2w=28-2l[/tex]               divide both sides by 2

[tex]w=14-l[/tex]

Where [tex]0<l<14[/tex]

Answer:

answer is w = 14

Answer:

Weak negative association

Step-by-step explanation:

because it is widely scattered, it is weak but in general it is negative

Answer:

weak negative association

Step-by-step explanation:

The association is negative because when variable x increase, variable y decrease.

Given that many points, like x = 1,  x = 2, et cetera, have more than 1 y-value associated and those values are spread, the association is weak.