Ms. stoner purchased a new computer for $1,150 at the apple store. if sales tax is 7.5%,what was the total of her purchase?

Trigonometry hellllllpppppppp asap

At which value in the domain does f(x) =0?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a