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3 years ago

Can anyone help me with this math plz? -7/8k=-21 show work plz

Mathematics

2 answers:

photoshop1234 [79]3 years ago

7 0

Answer:

k = 24

Step-by-step explanation:

Let's solve your equation step-by-step.

Step 1 : Multiply both sides by 8/(-7)

$(\frac{8}{-7} )$ * $(\frac{-7}{8} k)$ = $(\frac{8}{-7} )$ * $(-21)$

k = 24

Hope this helps, have a nice day!

Vaselesa [24]3 years ago

5 0

$-\frac{7}{8}k=-21\\\\k=-21:(-\frac{7}{8})\\\\k=-21\cdot(-\frac{8}{7}) \ (7 \ and \ 21 \ divide \ by \ 7)\\\\\huge\boxed{k=24}$

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Answer:

There are 200 trees per acre.

Step-by-step explanation:

47000 trees divided by 235 acres gets you 200 trees per acre.

When you go back and check your work, 200 trees per acre times 235 acres equals 47000 trees.

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3 years ago

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Oxana [17]

Answer:

1). $(x+\frac{1}{4})^{2}=\frac{4}{9}$

2). $x+\frac{1}{4}=\pm \frac{2}{3}$

Step-by-step explanation:

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3 years ago

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Graph:<br> 4p+1>-7 or 6p+3<33

Hoochie [10]

This problem involves only one variable, so we stick to one horizontal line, which represents p values. There is no vertical axis.

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If 6p+3<33, 6p<30. Dividing both sides by 6, p<5. Draw an open circle at p=5 and from this open circle draw an arrow to the right.

Now determine the p values for which your two arrows coincide. The first arrow begins at p=-2 and extends to the right from there; the second arrow begins at p=5 and extends to the left. So, the only coincidence of the two arrows is between -2 and +5 (noting that the arrows do NOT touch p=-2 or p=5).

The solution set can be writtten as -2<p<5, or as (-2,5).

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4 years ago

Follow the directions to solve the system of equations by elimination. 8x + 7y = 39 4x – 14y = –68 Multiply the first equation t

Leno4ka [110]

9514 1404 393

Answer:

(x, y) = (1/2, 5)

Step-by-step explanation:

We observe that the y-terms have coefficients 7 and -14. If we want to eliminate the y-terms, we need to multiply 7 by a factor that makes it be the opposite of -14. That factor will be -(-14)/7 = 2.

After multiplying the first equation by 2, we have ...

16x +14y = 78
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Adding these two equations gives ...

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Solving for x, we need to divide by 20:

x = 10/20 = 1/2

Substituting this into the first equation, we get ...

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7y = 35 . . . . . . subtract 4

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Then the solution is (x, y) = (1/2, 5).

_____

<em>Check</em>

We used the first equation to find y, so we know the x- and y-values satisfy the first equation. We need to check the result using the second equation.

4(1/2) -14(5) = -68

2 -70 = -68 . . . . . . . true; result checks OK

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