Marianna wants to buy a new tennis racket that costs $57.50. she has $8 and plans to save $4.50 each week. how many weeks will it take her to save money?

11 weeks

Step-by-step explanation:

she already has $8 so subtract that from $57.50:

57.5 - 8 = 49.5

so she needs to save $49.5. set up the problem like this, where x is the number of weeks needed:

4.5x = 49.5

divide each side by 4.5:

x = 11

it will take her 11 weeks.

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

a: 1/6, j: 1/4

step-by-step explanation: you are welcome