Use the following values to evaluate each expression. w = 13, x = 9, y = 1.9, z = 0.5 x2 + 4 A. 22 B. 85 C. 173 D. 7.61

Ricardo ran the 400 meter race 3 times his fastest time was 54.3 seconds his slowest time was 56.1 seconds if his average time was 55.0 seconds what was his time for the third race

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

I'm confused on this could anyone me and show me what i need to do to solve it.