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Angelina_Jolie [31]
3 years ago
11

I'm not sure how to do this. Please include steps. WILL GIVE BRAINLY IF RIGHT!!!

Mathematics
1 answer:
creativ13 [48]3 years ago
3 0

Answer:

30 gallons of first brand & 20 gallons of second brand

Step-by-step explanation:

Let the amount in gallons of 65% antifreeze needed be x.

Let the amount in gallons of 90% antifreeze needed be y.

You need to make a total of 50 gallons, so that gives us our first equation:

x + y = 50

Now we deal with the amount of pure antifreeze in each amount of antifreeze and in the result.

x gallons of 65% antifreeze contain 0.65x gallons of pure antifreeze.

y gallons of 90% antifreeze contain 0.9x gallons of pure antifreeze.

The result is 50 gallons of 75% pure antifreeze which contains 0.75 * 50 gallons of pure antifreeze. 0.75 * 50 = 37.5

Now we add the two amounts of pure antifreeze and set equal to the result.

0.65x + 0.9y = 37.5

This is the second equation. We have a system of two equations in two unknowns.

x + y = 50       Equation 1

0.65x + 0.9y = 37.5        Equation 2

Multiply the first equation by -0.65

-0.65x - 0.65y = -32.5

0.65x + 0.9y = 37.5    This is Equation 2.

Add the two equations above to eliminate x.

0.25y = 5

y = 20

Substitute 20 for y in the original equation and solve for x.

x + y = 50

x + 20 = 50

x = 30

Answer: 30 gallons of first brand & 20 gallons of second brand

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Solve each inequality, and then drag the correct solution graph to the inequality.
Nesterboy [21]

The correct solution graph to the inequalities are

4(9x-18)>3(8x+12)  →  C

-\frac{1}{3}(12x+6) \geq -2x +14  → A

1.6(x+8)\geq 38.4  →  B

(NOTE: The graphs are labelled A, B and C from left to right)

For the first inequality,

4(9x-18)>3(8x+12)

First, clear the brackets,

36x-72>24x+36

Then, collect like terms

36x-24x>36+72\\12x >108

Now divide both sides by 12

\frac{12x}{12} > \frac{108}{12}

∴ x > 9

For the second inequality

-\frac{1}{3}(12x+6) \geq -2x +14

First, clear the fraction by multiplying both sides by 3

3 \times[-\frac{1}{3}(12x+6)] \geq3 \times( -2x +14)

-1(12x+6) \geq -6x +42

Now, open the bracket

-12x-6 \geq -6x +42

Collect like terms

-6 -42\geq -6x +12x

-48\geq 6x

Divide both sides by 6

\frac{-48}{6} \geq \frac{6x}{6}

-8\geq x

∴ x\leq  -8

For the third inequality,

1.6(x+8)\geq 38.4

First, clear the brackets

1.6x + 12.8\geq 38.4

Collect likes terms

1.6x \geq 38.4-12.8

1.6x \geq 25.6

Divide both sides by 1.6

\frac{1.6x}{1.6}\geq  \frac{25.6}{1.6}

∴ x \geq  16

Let the graphs be A, B and C from left to right

The first graph (A) shows x\leq  -8 and this matches the 2nd inequality

The second graph (B) shows x \geq  16 and this matches the 3rd inequality

The third graph (C) shows x > 9 and this matches the 1st inequality

Hence, the correct solution graph to the inequalities are

4(9x-18)>3(8x+12)  →  C

-\frac{1}{3}(12x+6) \geq -2x +14  → A

1.6(x+8)\geq 38.4  →  B

Learn more here: brainly.com/question/17448505

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2 years ago
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by taking cubic root for both  sides

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3 years ago
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7. If F(x) = f(g(x)), where f(-2) = 8, f'(-2) = 4, f'(5) = 3, g(5)=-2, gʻ(5) = 6.. Find F'(5) <br>​
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Answer:

I'm going to lay this out in a chart so it's a little easier to see:

F(x) = f(g(x))

x | f (x) | f ' (x) | g (x) | g ' (x)

--------------------------------------

-2 | 8 | 4 |

5 | | 3 | -2 | 6

Remember the chain rule, which says

(f (g (x))) ' = g ' (x) f ' (g (x))

When they ask for F ' (5), they are asking for (f (g (x))) ' when x = 5.

Using the chain rule, that's

F ' (5) = g ' (5) f ' (g (5))

We can simplify using the numbers provided.

F ' (5) = (6) f ' (-2)

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F ' (5) = 24

I hope that helps!

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