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solmaris [256]
3 years ago
6

Plsss helppp brainkeistt reward

Mathematics
1 answer:
Mrac [35]3 years ago
6 0

Answer:

1. D

2. B

3. A

4. B

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What are the solutions to the equation?<br> 7x^3=28x
11Alexandr11 [23.1K]

7x³ = 28x is our equation. We want its solutions.

When you have x and different powers, set the whole thing equal to zero.

7x³ = 28x

7x³ - 28x = 0

Now notice there's a common x in both terms. Let's factor it out.

x (7x² - 28) = 0

As 7 is a factor of 7 and 28, it too can be factored out.

x (7) (x² - 4) = 0

We can further factor x² - 4. We want a pair of numbers that multiply to 4 and whose sum is zero. The pairs are 1 and 4, 2 and 2. If we add 2 and -2 we get zero.

x (7) (x - 2) (x + 2) = 0

Now we use the Zero Product Property - if some product multiplies to zero, so do its pieces.

x = 0        -----> so x = 0

7 = 0       -----> no solution

x - 2 = 0   ----> so x = 2   after adding 2 to both sides

x + 2 = 0  ---> so = x - 2  after subtracting 2 to both sides


Thus the solutions are x = 0, x = 2, x = -2.

6 0
3 years ago
Kevin plans to put concrete on a rectangular portion of his driveway the portion is 10 feet long and 3 inches high the price of
Fudgin [204]
First we need to know the total volume of concrete used:
V_total = \frac{cost_{total}}{cost{unit}}
V_total = \frac{\$72.98}{\frac{\$90}{yd^{3}}}
V_total = 0.7407yd^{3}

Now we can use the formula for volume of a rectangular prism:
V=lwh
Convert everythig to yards and substitute: 
0.7407yd^{3}=(3.33yd)(w)(0.08333yd)
w=\frac{0.7407}{3.33 \times 0.08333}
w \aprox 2.66yd
5 0
2 years ago
What is twice the difference of sixteen minus 13
Viefleur [7K]

Answer:

<h2>6</h2>

Step-by-step explanation:

2(16-13)\\\\\mathrm{Follow\:the\:PEMDAS\:order\:of\:operations}\\\\\mathrm{Calculate\:within\:parentheses}\:\left(16-13\right)\::\quad 3\\\\=2\times\:3\\\\= 6

3 0
3 years ago
Michael lives in the northwest corner of Clark County. Clara
timama [110]

Answer:

About 0.41 hours

Step-by-step explanation:

THe distance between Michael and Clara is 44 km.

We know D = RT,

Where

D is distance

R is rate (speed)

T is time

For Michael, we can write:

D = 47t

For Clara, we can write:

D = 61t

If we let michael's distance be x, Clara's distance would be 44 - x

So, we can say:

x = 47t

and

44 - x = 61t

Putting first equation into 2nd, we get:

44 - 47t = 61t

SOlving:

44 - 47t = 61t

44 = 61t + 47t

44 = 108t

t = 44/108 = 0.41 hours

The commute took 0.41 hours

7 0
3 years ago
Please help!<br> Simplify 2(<img src="https://tex.z-dn.net/?f=%5Csqrt%7B5x%5E%7B3%7D%20%7D%20%29%5E%7B2%7D%20%2B16" id="TexFormu
Maksim231197 [3]

Answer:

10x^3+16

Step-by-step explanation:

5 0
3 years ago
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