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

The temperature of a sample of liquid water changes from 50°C to 30°C. Which statement best explains the change that must happen at the molecular level? The molecules move more quickly and their average kinetic energy increases.

Y = 2x - 1; (-4, ), (0, ), (7, )

Mr. Wood went to the stores to buy school supplies for his children. He spent half of his money plus $5 at Store A. He then spent half of his remaining money plus $10 at Store B. At the end he had $25 left. How much money did Mr. Wood start with?

Optimize the equation P = 4x + 3y using the constraints x > 0, x < 4, y < 5. What is the maximum? a. 13 b. 15 c. - 3 d. 31

Which of the following is not a condition of a Tessellation? 1-it must be composed of one shape 2-it must be completely cover a surface 3 - it must have a repeating pattern 4-it must have no gaps or overlapping

Which angles are corresponding angles? check all that apply

An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period? A. (2d) / 3 B. (3d) / 4 C.

A bag contains 2 steel balls and 5 brass balls. The total weight is 13 pounds. If 2 steel balls are added and 2 brass balls are removed, the weight decreases to 12 pounds. How much does each kind of ball weigh?

A juice shop needed 360 oranges to make 40 L of fresh-squeezed juice. How many oranges would be needed to make 60 L of fresh-squeezed juice?

5) 6 (5a - 2) < 108 -1 0 1 2 3 4 5 6 7 8 9