Someone please help me on this

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

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.

You so much whoever answers with accuracy •the parent function of the graph of f(x) is the square root function, which was reflected across the x-axis. which of the following is the equation of f(x)?