Select all that apply. Which symbols could be used to make the following statement true?

-15 ___ -19

≤

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

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

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?