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3 years ago

Use the function f(x) = 2x3 - 3x2 + 7 to complete the exercises. f(−1) = f(1) = f(2) =

Mathematics

1 answer:

anyanavicka [17]3 years ago

5 0

Answer:

2, 6, 11

Step-by-step explanation:

To evaluate f(- 1) substitute x = - 1 into f(x)

f(- 1) = 2(- 1)³ - 3(- 1)² + 7 = 2(- 1) - 3(1) + 7 = - 2 - 3 + 7 = 2

Similarly

f(1) = 2(1)³ - 3(1)² + 7 = 2(1) - 3(1) + 7 = 2 - 3 + 7 = 6

f(2) = 2(2)³ - 3(2)² + 7 = 2(8) - 3(4) + 7 = 16 - 12 + 7 = 11

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4 years ago

Melanie bought 4 large gifts and 2 small gifts. Mary bought 1 large gift and 20 small gifts. Each small gift costs $10. They bot

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Answer:

One large gift costs $60.

Step-by-step explanation:

Mary spent $200 (20 x $10) on small gifts. This means that:

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Melanie spent $20 (2 x $10) on small gifts. This mean that:

Melanie = $20 + 4 large gifts

Because the amount Melanie and Mary are equal, we know that:

$200 + 1 large gift = $20 + 4 large gifts

To work out the cost of 1 large gift, you first need to work out the difference of large gifts. (4-1=3). Melanie bought 3 more large gifts than Mary.

This means that:

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$180 = 3 large gifts

Finally, divide both sides by 3 to find the cost of 1 large gift.

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