What does number sentence mean

Let x^2+15x=49. What values make an equivalent number sentence after completing the square?

What is the area of a triangle with side lengths 13-14-15?

What percent of 15 is 75? What percent 0f 32 is 40? What percent of 88 is 88? What is 63% of 150? What is 150% of 63? What is 1% of 1?

Solve the following equation. justify each step 0.2x+3.1-2.1x=0.3 (x-5) + 0.2

Which is the better by 3 pounds for 8.31 or 5 pounds for 12.95

What is the difference between - 4x - 6 and 2x + 4? Show work.

Solve the quadratic equation by factoring. check your solutions in the original equation. (enter your answers as a comma-separated list.) 2x2 = 19x + 33

A culture started with 3000 bacteria. After 4 hours, it grew to 3,600 bacteria. Predict how many bacteria will be present after 10 hours. Round your answer to the nearest whole number.

Find the number of terms in this polynomial. 9p2 + 3p - 2

What is the simplified form of the ninth root of x times the ninth root of x times the ninth root of x times the ninth root of x