A = 1/2(a + b), for a

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?

Use a standard normal table to determine the probability. give your answer as a decimal to four decimal places. −1.5< < 1.5)

How do u write a function for the reflection across the y axis