Solve for a 3a+9 = 18 *
a = 5
a = 10
a = 3
None of the above

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

What is the distance between (–2 1/2,-3) and (1, –3)?

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed