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3 years ago

Solve for x. -3x + 4 = -8

Mathematics

2 answers:

Sav [38]3 years ago

7 0

-3x+4=-8
-3x=-8-4
-3x=-12
X=-12 divided by -3
X=4

Mars2501 [29]3 years ago

3 0

-3x+4=-8
-4 -4
-3x=-12
----- -----
-3 -3
X=4

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Which table shows a proportional relationship between x and y

Tomtit [17]

Answer:

The answer is B (1 , 3) , (2 , 6) , (4 , 12) , (5 , 15)

Step-by-step explanation:

∵ X : 1 , 2 , 4 , 5

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2 years ago

The surface area of a melting snowball decreases at a rate of3.8cm2/min. Find the rate at which its diameter decreases when the

Scorpion4ik [409]

Answer:

Step-by-step explanation:

This is a pretty basic related rates problem. I'm going to go through this just like I do in class when I'm teaching it to my students.

We see we have a snowball, which is a sphere. We are talking about the surface area of this sphere which has a formula of

$S=4\pi r^2$

In the problem we are given diameter, not radius. What we know about the relationship between a radius and a diameter is that

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$S=4\pi(\frac{d}{2})^2$ which simplifies to

$S=4\pi(\frac{d^2}{4})$ and a bit more to

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$-3.8=\pi(2)(13)\frac{dD}{dt}$ and solving for the rate at which the diameter is changing:

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3 years ago

What is 2/3 + 1/4<br>*please help*

Tcecarenko [31]

$\frac{2}{3}+\frac{1}{4}$

Re-write with a common denominator, in this case 12:

$\frac{2 \times 4}{3 \times 4}+\frac{1 \times 3}{4 \times 3}$
$\frac{8}{12}+\frac{3}{12}$

Add:
$\frac{8}{12}+\frac{3}{12} = \frac{11}{12}$

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3 years ago

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