Please help quickly for my test! Given: ABCD is a parallelogram and AC ≅ BD
Prove: Angle ABC is a right triangle

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

How many real-number solutions does the equation have? -4x^2 + 10x + 6 = 0 a. no solutions b. two solutions c. infinitely many solutions d. one solution

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'