40% of x is 35. (show work) a.
Write an equation that shows the relationship of 40%, x, and 35.
b.
Use your equation to find x. Show your reasoning.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?

The focus of a parabola is (-4,-5) and its directrix is y=-1 find the equation