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4 years ago

Ummmmmm Helppppppp Needeeeeeed

Mathematics

2 answers:

leva [86]4 years ago

8 0

Answer:

d: $20(n-1)$

Step-by-step explanation:

$2\left(n-7\right)-3\left(2-6n\right)$

Expand:

$2n-2*7-3*2-(-3)*6n$

$2n-14-6+18n$

$2n+18n-14-6$

$20n-20$

Factorise:

$20(n-1)$

belka [17]4 years ago

5 0

Answer:

I dont really know, but you dont have to listen but i think its D! its D!

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Cerrena [4.2K]

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4 years ago

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Find the values of x and y in the diagram and show work please it's for geometry class

Romashka-Z-Leto [24]

Answer:

x = 10

y = 70

Step-by-step explanation:

By using the vertical angles theorem we know that x+ y +10 = 90, also simplified to x + y = 80

and 2x + y = 90

By using the substitution method on x + y = 80, it will be y = -x + 80

When you put into the equation 2x + y = 90 you will get 2x -x +80 = 90

Then it will simplify to x = 10

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3 years ago

The difference of r and 7 divided by the<br> sum of 6 and

storchak [24]

Answer:

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Step-by-step explanation:

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5 0

3 years ago

Cynthia Besch wants to buy a rug for a room that is 21 ft wide and 34 ft long. She wants to leave

Daniel [21]

Answer:

Dimensions of the rug = 13 ft × 26 ft

Step-by-step explanation:

Dimensions of the room = 21 ft × 34 ft

Area of the room = 21 × 34 = 714 ft²

Cynthia wants to leave a uniform strip of floor around the rug.

Let the width of the rug = x ft

Then the dimensions of the rug will be = (21- 2x)ft × (34 - 2x)ft

Area of the rug = (21 - 2x)×(34 - 2x) square feet

338 = (21 - 2x)×(34 - 2x)

338 = 714 - 68x - 42x + 4x²

4x² - 110x + 714 - 338 = 0

4x² - 110x + 376 = 0

2x² - 55x + 188 = 0

2x² - 47x - 8x + 188 = 0

x(2x - 47) - 8(x - 47) = 0

(x - 4)(2x - 47) = 0

x = 4, $\frac{47}{2}$

For x = 23.5 area of the rug will be negative.

Therefore, x = 4 ft will be the width of the rug.

Dimensions of the rug will be 13 ft × 26 ft.

7 0

3 years ago

Chelsea deposits $600.00 into a bank account and is earning 8.5%simple interest. She decides to keep the account for 4 years. a)

snow_lady [41]

Answer:

$204 in interest

Step-by-step explanation:

Plug in each variable into the simple interest formula: I = PRT

P = $600

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T = 4 years

3 0

3 years ago