Sandra's scores on the first 4 tests were 87, 92, 76 and 89. What is the minimum score she needs to make on the fifth test so that her average is at least an 80.

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters

I’m not good at math can i have ? ?