Suppose that a travel bureau claims that the trees in a forest are 83 feet tall on average, with a standard deviation of 0.2 feet. if you took a sample of 64 trees, which of the following mean heights would be outside the 95% confidence interval?

a. 83.2 feet
b. 83.4 feet
c. 83.6 feet
d. 82.8 feet

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

It says factor each expression 49x-28?

Someone answer asap for ! a ball is rolled down a ramp. the height, f(x), in meters, of the ball x seconds after it is released is modeled by the function f(x) = x²- 10x + 25 for all values of x from 0 to 5. which statement about the ball is true? a. the maximum height of the ball is 5 meters b. the height of the ball increases from 0 to 5 meters above the ground. c. the ball has traveled 5 meters when it reaches the bottom of the ramp. d. the ball has been traveling for 5 seconds when it reaches the bottom of the ramp