Ineed how do you solve 5 + x to the 2nd power = 2x2 + 13

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Tatiana wants to give friendship bracelets to her 32 classmates. she already has 5 bracelets, and she can buy more bracelets in packages of 4. write an inequality to determine the number of packages, p, tatiana could buy to have enough bracelets.

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)