Declan's goal is to score 90% on the upcoming science test. If there are 50 questions on the test, how many does he need to answer correctly?​

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

Divide. reduce the answer to lowest terms.5 2/3 ÷ 3 1/9