What is the answer to this math problem 90 ÷ [18 - {36 ÷ 4 + (32 - 4 x 7)}] PLS I NEED THE ANSWER QUICK

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Compare the following pair of numbers a and b in three ways. a. find the ratio of a to b. b. find the ratio of b to a. c. complete the sentence: a is percent of b. a=120 and b=340 a. the ratio of a to b is . b. the ratio of b to a is . c. a is nothing percent of b.

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.