Apreschool playground has both bicycles and tricycles. there is a total of 30 seats and 70 wheels. how many bicycles are there? how many tricycles are there?

The system of equations graphed below has how many solutions? y = 2x + 2

Find the area of a parallelogram with base 15 yards and height 21 2/3

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15