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Anon25 [30]
3 years ago
12

Can someone help me with these questions please?

Mathematics
1 answer:
kotykmax [81]3 years ago
3 0

Step-by-step explanation:

You can solve systems of equations using either substitution or elimination.  For these problems, I recommend elimination.  I'll do the first one as an example.

-3x + 16y = 9

-4x + 8y = 12

Multiply the second equation by -2.

8x − 16y = -24

Add to the first equation (notice the y's cancel out).

(-3x + 16y) + (8x − 16y) = 9 − 24

5x = -15

Solve for x.

x = -3

Now you can plug this into either equation to find y.

-3(-3) + 16y = 9

9 + 16y = 9

y = 0

The solution is (-3, 0).

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Answer:

4\frac{3}{4}  hours

Step-by-step explanation:

he was gone for 5 \frac{1}{4} hours, he spent \frac{1}{2} an hour driving.

5 \frac{1}{4} - \frac{1}{2} = 4\frac{3}{4} hours at  work.

6 0
3 years ago
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katrin2010 [14]

Answer:

C. 5 Shirts for $21

Step-by-step explanation:

I conclude this when I calculate the amount of money needed for a singular shirt in every "bundle" by using division.

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As for the other packs, my calculations resulted in $4.50 for the 4 shirts pack and $4.20 for the 5shirts pack.

5 0
2 years ago
Find the missing angle measurements. Screenshot included.
zheka24 [161]
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3 years ago
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ivann1987 [24]

Answer:

$340

Step-by-step explanation:

85 x 4 = 340.

Because 85 = 1/4, 4/4 = 85 x 4 = 340

8 0
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13.33 is the answer just divide 4/30 and there ya go! :D Hope this helps!
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