Mathematics

How do you work out this problem using completing the square x2 - 4x - 80 = 0
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Evaluate the expression 80 + (8 x 4) 2
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I don't know how to simplify this question. Is quotient rule necessary?
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sin K =A. 1/2B. (3)/3C. 23D. 2
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In a high school graduating class of 128 students, 52 are on the honor roll. Of these, 48 are going on to college; of the other 76 students, 56 are going on to college. What is the probability that a student selected at random from the class is (a) going to college, (b) not going to college, and (c) not going to college and on the honor roll?
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I need to find what the variable is in this equation -7+m=-9
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Two cards are selected from a standard deck of 52 playing cards. The first card is not replaced before the second card is selected . Find the probability of selecting a black card and selecting a red card. The probability of selecting a black card and then selecting a red card is
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At how many points does the graph of the function below intersect the x-axis?y = 4x2 - 6x +1Apex
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Mr Davis buys 30 tickets for the drama club to attend a play. The tickets cost n dollars each for a total of $360
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Multiply each equation by a constant that would help to eliminate the y terms.2 x minus 5 y = negative 21. 3 x minus 3 y = negative 18.What are the resulting equations?6 x minus 15 y = negative 63. Negative 15 x + 15 y = 90.6 x minus 15 y = 63. Negative 15 x + 15 y = 90.6 x minus 15 y = negative 63. Negative 15 x + 15 y = negative 90.6 x minus 15 y = negative 63. Negative 15 x + 15 y = 90.
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PLEASE HELP , TRYING TO BE ON HONOR ROLL !What is the solution to this system of equations?3x + 6y = 1x - 4y = 1 A. ( 0, -1/4) B. (2/9 , 1/18) C. (1/2 , -1/8) D. (5/9, -1/9)
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Mona stopped at a gas station where the price per gallon was $2.80. She spent $14 to fill up her car. What equation would represent how much gas Mona purchased? How many gallons of gas did Mona purchase? If Monas car gets 20 miles per gallon, how many miles did she drive since the last time she filled up her tank?
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Find the number of sides of a polygon whos interior angles add up to 3780
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Write the inequality shown in the graph below:
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Ratio of girls to boys is 3:8. if there are 48 boys, how many girls are there
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solve the equation, and check the solution. 1/3s =1/5
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answer the question Please ASAP The independent variable isA: Number of friends (f) B: Number of cost (c) The dependent variable isA: Number of friends (f) B: Number of cost (c) The equation that can be used to represent this relationship: A: c = 20fB: f = 20c C: c = 10fD: f = 10c
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Bridget takes a 5-inch by 4-inch rectangle of fabric and cuts from one corner of the piece of fabric to the diagonally opposite corner. Now Bridget has two equally sized triangles of fabric. What is the perimeter of each triangle? If necessary, round to the nearest tenth.
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The sum of two numbers is 100 and their difference is -20. What are the two numbers?
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N To be able to afford the house of their dreams, Dave and Leslie must clear $128,000 from the sale of their first house. If they must pay $780 in closing costs and 6% of the selling price for the sales commission, then what is the minimum selling price for which they will get $128,000?
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how do you write 11% as a decimal?
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Find an equation for the parabola with focus at (-5,-4) and vertex at (-5,-3)
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A force of 6 lb is required to hold a spring stretched 8 in. beyond its natural length. How much work W is done in stretching it from its natural length to 11 in. beyond its natural length?
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An aptitude test has a mean score of 80 and a standard deviation of 5. The population of scores is normally distributed. What raw score corresponds to the 70th percentile?
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