Twice the sum of a number and 3 times a second number is 4. The difference of ten times the seco number and five times the first is 90. Find the numbers.

The area of a rectangle is 54x^9y^8 square yards.if the length of the rectangle is 6x^3y^4 yards,which expression represents the width of the rectangle in yards

The focus of parabola is (-4, -5), and its directrix is y= -1. fill in the missing terms and signs in parabolas equation in standard form

Which of the following parabolas opens up?