In order for the data in the table to represent a linear function with a rate of change of +5, what must be the value of a? a = 3 a = 8 a = 18 a = 33

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=9, and ac=12, find hc.

Is the power produced directly proportional to the wind speed, give reasons for your answer?

Ateacher wanted to buy a chair, a bookshelf, two tables and a desk. she spent $900 for all five items and the chair and the desk combined 70% of her total. if the bookshelf cost $50, how much did each of the tables cost?