What is the length of EF in the right triangle below?

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

Josie buys a pair of boots that retail for $52.00 dollars, however they are currently on sale for 25% off how much does josie pay for the boots if there is also a 6% sales tax on them

Zahra wants the equation below to have an infinite number of solutions when the missing number is placed in the box.