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2 years ago

PLEASE HELP ILL MARK BRAINLIEST

Mathematics

1 answer:

Anika [276]2 years ago

7 0

Answer:

-8

Step-by-step explanation:

x + 2(4)=0

x+8 =0

x= -8

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The dimensions of a rectangle can be given by x+9 and x-2. If the area is 60ft^2, what is the value of X?

Anestetic [448]

Answer:

$x=5$

Dimensions of rectangle are

W=14 and L = 3

Step-by-step explanation:

Are of rectangle is

$A=WL$ --------(1)

Where W is width and L is length of rectangle

Here

A=60

W=x+9

L=x-2

Substituting values in equation (1)

$60 = (x+9) (x-2)$

$60 = x^{2} +9x -2x -18$

$x^{2} + 7x - 78 = 0$

Using quadratic formula

$x=\frac{-b +/- \sqrt{b^{2} - 4ac} }{2a}$

Here a=1, b=7 and C=-78

$x= \frac{-7 +/- \sqrt{7^{2} - 4(-78)} }{2}$ (Here +/- = ±)

$x= \frac{-7 +/- \sqrt{ 49 + 312} }{2}$

$x= \frac{-7 +/- \sqrt{ 361} }{2}\\x= \frac{-7+/- 19}{2}$ $x= \frac{-7 + 19 }{2} \ \ and \ \ x= \frac{-7-19 }{2}$

$x= \frac{12 }{2} \ \ and \ \ x= \frac{-26 }{2}$

$x= 5 \ \ and \ \ x= -13$

x cannot be negative (Negative x means -ve dimensions of rectangle). Therefore

$x=5$

Dimensions of the rectangle are

$W=x+9 = 5+9 = 14$

$L= x - 2 = 5-2 = 3$

5 0

3 years ago

The mean age of 6 women in an office is 34 years old. The mean age of 8 men in an office is 34 years old. What is the mean age (

Volgvan

Step-by-step explanation:

204+272/14=34 years old

3 0

3 years ago

Write a list of numbers that you would get if you used the rule 10n (Hint: n=1, n=2 , n=3........)

grandymaker [24]

Answer:

List of number according to rule: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120..........

Step-by-step explanation:

Rule = 10 n

If n=1,2,3......

List of number according to rule= 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120..........

6 0

3 years ago

What is the first step to isolate the variable term on one side of the equation?

Vilka [71]

Answer:

the answer to the whole equation is x=30.

Step-by-step explanation:

do 2/3(2) and -1/2(3)

4/6x and -3/6x

add the -3/6x to the other side

7/6x or 1 and 1/6x=5

times both by 6

x=30

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3 years ago

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amid [387]

Answer:

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Step-by-step explanation:

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3 years ago