True or false: a variable expression consist of numbers or operations

Given a circle with center (8,-2) and radius 17

What are the steps to solve a^2+6a+9/a-10?

Maria said,"the 4 in 400,000 has a value of 400." is maria correct? explind

Craig is training for a race. He bikes every 2 days and swims every 3 days. If he biked and swam today, how many days will pass before he bikes and swims on the same day again, the least common multiple of the numbers of days?

Solve for x 2m-nx=x+4

John is twice as old as Mary. The sum of their ages is 21. How old is Mary? Let J = John's age and M = Mary's age. Select the system equations that represents the problem. J - 2M = 0 M - 2J = 0 J + M = 21 J = M + 2

A function is defined by f (x) = x/4, what is f (-8)

Find tan θ if sec θ = √26/5 and sin θ < 0.

Why do you think you need to add zero pairs to get the - 1 - tiles to fit in the rectangle?

Could someone explain to me how to find the unit value for something?