What is the sum of any number and it's addictive inverse

Calculate the area of triangle ABC with altitude CD, given A (-3,-4) B (-6,2) C (0,0) D (-4,-2) 14 square units 15 square units 18 square units 20 square units

How many positive, three-digit integers contain at least one $3$ as a digit but do not contain a $5$ as a digit?

What's the percent of change of 125 days to 125.4

The length of a rectangular garden is 3yd more than twice it's width. The perimeter of the garden is 36yd. What are the width and length of the garden?

In math, is it possible to simplify the fraction 19/20

Carol put some green and red unit cubes in a box. The ratio of the number of red cubes is 2:1. She adds 12 more red cubes in the box and the ratio becomes 4:5.

A right triangle has a perimeter of 84. The ratio of each of the sides are 3:4:5. What are the lengths of each side of the triangle?

Given the function f (x) = - 3x3 + 9x2 - 2x + 3, what part of the function indicates that the left end starts at the top of the graph?

A square is cut into two congruent triangles by drawing the diagonal between two corners. If the area of each triangle is 162 cm, what is the length of the side of the square?

Suppose ΔXYZ is given, and you want to construct ΔABC so that the triangles are congruent. Which constructions would guarantee that ΔXYZ ≅ ΔABC? Check all that apply.