The amount of a certain toxin in the water is normally distributed with mean 72.4 mg and standard deviation 20 mg. the probability that the amount of toxin exceeds the safe limit is 0.14. what is the safe limit?

A football field is 120 yards long and 160 feet wide. What is the area in square yards?

What is the slope of this line - 4x+7=2y-3

4+12+36+108 + ... + 2916

if the radius of circle r is 7 and the radius of circle s is 9, what is the ratio of the circumference of circle r to circle s

Given Event A, Event B, and Event C. Event A and Event B are mutually exclusive. Event A and Event C are not mutually exclusive. P (A) = 0.15 P (B) = 0.35 P (C) = 0.55 What is the probability of the complement of Event B? 0.85 0.35 0.65 0.45

Mr. Johnson is buying paint to paint the garage wall. He needs to know the area of the wall in order to know how much paint he will need to buy. The wall is 22 feet wide and 11 feet tall. What is the area of the garage wall? A. 242 square ft B.

What percent of 2150 is 688

The half-life of Sodium-24 is 15 hours. If you start with 600 grams of sodium-24 how much would be left after 4 days? Which of the following equations could you use to solve for the amount of grams left after 4 days?

Julia can finish a 20-mile bike ride in 1.2 hours. Katie can finish the same bike ride in 1.6 hours. To the nearest tenth of a mile, how much faster does Julia ride than Katie?

What value of x makes the equation true? 1/2 (4x-5) + 5/2=10