Which side lengths form s right triangle?
A. 5,12,13
B. 4,4,8
C. 2,3,4
plz help ​

What is the value of x when x + 7 = 21?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Match each whole number with a rational, exponential expression 3 square root 27^2find the domain and range of the exponential function h(x)=125^x. explain your findings. as x decreases does h increase or decrease? explain. as x increases does h increase or decrease? explain.