Tickets to a concert cost $2 for children and $5 for adults. If 630 people attended the concert and the ticket sales totaled $2,910, how many children attended the concert?

If a proper fraction in lowest terms is subtracted from its reciprocal, the difference is 77/18. What is the proper fraction.

Perimeter of a square is (12x-2y). What is the algebraic expression for the length of the side of the square?

Heba ate 1/12 of a box of cereal. Now the box is 3/4 full.

Simplify. 21 17⋅2-15 1

What is the solution to the equation n + 12 = 17? n = 29 n = 5 n = 3 n = 27

3. "a varies directly with b". If a = 4 when b = 21, find a when b-7.

Evaluate the expression using order of operations 8-3[{4+2}+6]=?

Let n be a prime number. Which of the following statements CAN be true? A. n is a perfect square B. n is even C. n is irrational D. nis negative E n is divisible by 4

Katie practiced the flute for 45 minutes. Then, she ate a snack for 15 minutes. Next, she watched televison for 30 minutes, until 6:00 P. m. At what time did Katie start practicing the flute?

The vertex form of the equation of a parabola is y = (x+3) ^2+53. what is the standard form?