Hello random person and it would be very helpful if you know this answer! Write the phrase as an expression.

1. 15 decreased by the product of a number x and 4.

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

What is the value of the discriminant of the quadratic equation -2x = -8x + 8 and what does its value mean about thenumber of real number solutions the equation has?