Write an equivalent expression for 3x + 12 + 7x + x

Sara sells beaded necklaces she makes a profit of 4 dollars pn every neclace she sells which table represents the profit sara makes

Evaluate the expression for the given value of the variable. 5×(h+3) for h=7

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.