2(x + 5) = 30 what does x equal?

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?