What substitution should be used to rewrite 4x^4 - 21x^2+20=0 as a quadratic equation

What is the length of HJ expressed in terms of pie?

Susie has $15.66 to spend on lunch for herself and her friend. If she spends an equal amount on each person. How much will susie spend on each of them?

2. Fran bought sneakers for $54.26 and a shirt for $34.34. If Fran started with $100 about how much money does she have left?

How is a ratio any different than a fraction?

The barrels weighed 723 lbs apiece. The ships cargo includes 507 barrels. Therefore, the barrels added how many lbs in weight to the ships cargo? 366,561 561,386 36,561 25556

A+b=s+r for s I have no idea how to solve this

What is the degree of a polynomial that has roots of - 2, 4i and - 4i?

What is the x value in the solution to the system of linear equations 2x - y = 11 and x + 3y = - 5

How do you find the tangent of a circle?

Greatest common factor of 15 and 30 and 45