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bezimeni [28]
3 years ago
7

Simplify the expression to a polynomial in standard form: (3x+1)(2x^2-5x+7)

Mathematics
1 answer:
Ilia_Sergeevich [38]3 years ago
5 0

Answer:

6x^3-13x^2+16x+7

Step-by-step explanation:

(3x+1)(2x^2-5x+7)

6x^3-15x^2+21x+2x^2-5x+7

6x^3-15x^2+2x^2+21x-5x+7

6x^3-13x^2+16x+7

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Answer:

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  • $45,000

Step-by-step explanation:

Where x represents the previous year's salary, its amount this year is said to be ...

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The equation is trying to reflect the fact that 7% of that is $3,290. The missing number is 2000:

  0.07(x +2000) = 3290

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Solving for x, we find ...

  x = (3290/0.07) -2000 = 45000

Sandra's salary the previous year was $45,000.

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If a rock falls from a height of 40 meters on Earth, the height H (in meters) after x seconds is approximately
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Once the rock hits the ground, we know that its height will be equal to 0m
because of this, we can replace H(x) with 0
40 - 4.9 {x}^{2}  = 0
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so..
4.9 {x}^{2}  = 40
then
{x}^{2}  = 40 \div 4.9
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2 years ago
An element with mass 780 grams decays by 17.1% per minute. How much of the element is remaining after 19 minutes, to the nearest
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2 years ago
Decrease 216 by 37 1/2%
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Step-by-step explanation:

In this question we need to decrease 216 by 37\dfrac{1}{2}\% or 37.5 %.

For this, firstly find 37.5 % of 216.

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Now subtracting 81 from 216 to find decrease of 216 by 37.5 %.

So,

216-81 = 135

Hence, 135 is the decrease of 216 by 37.5 %.

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