The weights of a group of 10-year-old boys are normally distributed with a mean of 70 pounds and a standard deviation of 12 pounds. What is the z-score for a 10-year-old boy who weighs 64 pounds?

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

Which situation can be modeled by the inequality 5 + 10w ≥ 45? a. you start with $5 and save $10 a week until you have at least $45. b. you start with 5 baseball cards and purchase 10 cards every week until you have at most 45 cards. c. you start with 5 water bottles and purchases cases of 10 water bottles each until you have a total of 45 water bottles. d. you spend $5 plus $10 per week until you have less than $45.

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20