It costs $3.45 to buy 3/4 lb of chopped walnuts. How much would it cost to purchase 7.5 lbs of walnuts? Explain or show your reasoning.

the answer would be 25.875

Step-by-step explanation:

we are given

It costs $3.45 to buy lb of chopped walnuts

so,

1 lb of chopped walnuts = $3.45

now, we can multiply both sides by 7.5

7.5\times 1lb=7.5\times 3.457.5×1lb=7.5×3.45

so, we get

7.5 lbs of chopped walnuts = $25.875

So, the cost of 7.5 lbs of chopped walnuts is $25.875

- 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