Which values make this equation true?

(5x^7 y^2) (-4x^4 y^5) = -20x^a y^b

A.) a=11, b=7

B.) a=11, b=10

C.) a=28, b=7

D.) a=28, b=10

A gumball machine contains 23 green gumballs, 52 red gumballs, 34 blue gumballs, 61 yellow gumballs, and 300 pink gumballs. What percentage of the gumballs are red?

What is the average speed (mph) for a car journey of 120 miles that began at 9:30 am and finished at 12:00 noon.

What is 40% out of 30

Jonathan has 3/4 pound of grapes. How many 1/8 pound servings can he make from his grapes.

How to find the roots of a quadratic equation with leading coefficient greater than 1?

Kenya bought 28 beads and nancy bought 25 beads. It takes 35 beads to make a necklace. Write and solve two addition equations to find how many more beads they each need to make a necklace

How to find the vortex

Assume that the candle manufacturer has 4 types of round candles and 8 types of square candles available, and a gift set consists of 3 round and 3 square candles. How many different gift packages are possible?

Which of the following expressions is equivalent to - 9? A. 63 : 7 B. - 63 : 7 C. - 7 : 63 D. - 63 : (-7)

What's the Lcm of 6 and 10