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faltersainse [42]
3 years ago
10

What is the value of the expression –5x4 when x = –2?

Mathematics
1 answer:
igomit [66]3 years ago
4 0
It is definitely c, 80
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A rectangle with sides measuring x in. and 4x-1 in. has an area of 663in.^2. What are the dimensions of the rectangle?
serious [3.7K]

9514 1404 393

Answer:

  13 in by 51 in

Step-by-step explanation:

The area is the product of the dimensions, so is ...

  663 = x(4x -1)

  4x^2 -x -663 = 0 . . . . . . subtract 663 to put in standard form

Using the quadratic formula, we can find the solutions.

  x = (-(-1) ±√((-1)^2 -4(4)(-663)))/(2(4))

  x = (1 ± √10609)/8 = (1 ±103)/8

Only the positive solution is of any use in this problem, so ...

  x = 104/8 = 13

  4x-1 = 4(13)-1 = 51

The dimensions of the rectangle are 13 inches by 51 inches.

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I find it easiest to solve these using a graphing calculator.

8 0
3 years ago
Bailee had a gross income of $2358.33 during each pay period in 2009. If she got paid monthly, how much of her pay was deducted
wariber [46]
FICA is 6.2% of your gross compensation. To calculate the amount deducted for FICA, determine the gross compensation in 2009. In this problem, Bailee's gross income per month is $2358.33.

Yearly income:

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Thus, the FICA deduction is $1754.60
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Step-by-step explanation:

because my teacher told me

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Marta_Voda [28]

7x+3<26 is the answer

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