Why does no one answer by questions in math I think they can't answer them?

420=2 (r+10) what is the total value of r

Which values of A and B make the following equations 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

What is 6*5/8 in whole numbers

Divide 109.86 by 10.3

There are already 1,200 gallons of water in a swimming pool. If water is filling the pool at a rate of 20 gallons per minute, which expression indicates the amount of water, in gallons, in the swimming pool after m minutes? A. 1,200 + 20 * m B.

Ally sold 5 oven toasters and 3 rice cookers for $500. If a rice cooker cost $20 less than an over toaster, find the cost of a rice cooker.

Over which interval is the graph of f (x) = -x^2+3x+8 increasing

Does 0.15>0.105 yes or no

22x - y = - 23 (equation 1) 11x + 12y = 1 (equation 2) To find the value of x, you need to substitute in equation 2. The value of x is.

It took Miguel 7 mins 38 secs to run one mile. It took Jorja 9mins 13 secs to run one mile. How many more seconds did it take to run one mile than Miguel