The compressive strength of concrete is being tested by a civil engineer who tests 12 specimens and finds that the sample mean is 3259.9 psi and the sample standard deviation is 35.57 psi. Compressive strength is known to be normally distributed.

Find a 95% confidence interval for mean compressive strength.

Consider the function f(x)=-5x+3 what is f(-2)

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?

Find the area of an equilateral triangle with a side of 6 inches