Which of the following equations represents a quadratic function?
a.(3b)(5b-7)(b+8)=0
b. (2x-3)(4x+5)=10x
c. y(y+4)(y-6)=0
d. z^2+2=3z(z^2-1)

Convert 50 kilogram to pounds. (the conversion factor from kilogram to pound is 2.2046.) a. 52.2 lb. b. 110.2 lb. c. 22.6 lb. d. 47.8 lb.

Assume that the weights of quarters are normally distributed with a mean of 5.67 g and a standard deviation 0.070 g. a vending machine will only accept coins weighing between 5.48 g and 5.82 g. what percentage of legal quarters will be rejected? round your answer to two decimal places.

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16