An auditorium has 12 rows with 15 seats on the first row, 18 seats on the second row, 21 seats on the third row, and so forth. How...
expand and fully simplify x(x+4)+3(x+4)
6x^2+7x-5
1/4 of 218
(2y÷4)+10=-6
9:x::x:81
expand and fully simplify 2(3x+1)-5(3x+1)
30:45::50:x
(2x÷4)-8=-7
