Please help me this is my last question please

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

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.

Iwill give brainliest. give accurate answer, . suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?