Which expressions are quadratic expressions? Check all that apply. z^2
2x + 7x – 10
2x^2 + 9x – 7
500(0.25)^t – 1
13x^3 + 21x^2 – 5
There is more than one answer. Please answer fast. I will mark brainliest!

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

The suare root of 9x plus 7 plus the square rot of 2x equall to 7