1 year ago

Can someone help me with this?

Mathematics

1 answer:

Vinil7 [7]1 year ago

8 0

U can refer to the picture that I’ve attach below

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kvasek [131]

Answer:

C. 7x + 11

Step-by-step explanation:

$(13x-4)+(-6x+15)$

$13x-4-6x+15$

$7x+11$

4 0

2 years ago

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If x varies directly with y and x = 3.5 when y = 14, find x when y = 18.

maks197457 [2]

Answer:

x = 4.5

Step-by-step explanation:

there's definitely other ways to solve this, but I used a proportion.

$\frac{3.5}{x} = \frac{14}{18}$

Then you can make this equation:

14x = 3.5 * 18

I solved for it and got 4.5 .

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2 years ago

What is 4 3/4 - 1/3 = in fraction form

pentagon [3]

Answer:

53/12

Step-by-step explanation:

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2 years ago

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Kruka [31]

Answer:

The answer is 20

Step-by-step explanation:

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2 years ago

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What two numbers multiply to get 25 and add to -10

SOVA2 [1]

$x;\ y-the\ numbers\\\\ \left\{\begin{array}{ccc}xy=25\\x+y=-10&\to x=-10-y\end{array}\right\\\\subtitute:\\(-10-y)y=25\\(-10)(y)-y(y)=25\\-10y-y^2=25\\-y^2-10y-25=0\ \ \ \ |change\ the\ signs\\y^2+10y+25=0\\y^2+5y+5y+25=0\\y(y+5)+5(y+5)=0\\(y+5)(y+5)=0\\(y+5)^2=0\iff y+5=0\to \boxed{y=-5}\\\\subtitute\ the\ value\ of\ y\ to\ the\ equation\ x=-10-y\\x=-10-(-5)\\x=-10+5\\\boxed{x=-5}\\\\Answer:\boxed{-5\ and\ -5}$

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3 years ago