What number should go into the blank so that the two expressions are equivalent to each other? (Use only the digits 0 - 9 to write the number.)
2(a + 8) = a + 21 + a-_

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Explain how to graph a scatterplot and its regression line using a regression calculator.