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nika2105 [10]
3 years ago
11

How do I solve this?

Mathematics
2 answers:
laila [671]3 years ago
7 0
The < is just like and equal sign just looks a little different think of it that was for the first couple steps. So you have 13-3y<-5. First do, -5+13=8. Now you have -3y<8. Then your want to do 8 divided by -3 and you get=-2.666666667 and that equals y.

-2.7=y then make that equal sign into the normal sign again. -2.7
satela [25.4K]3 years ago
3 0
You want to get y by itself.
To do this with the equation 13 -3y < -5 you want to subtract 13 from both sides.

13 -3y < -5
-13 -13

This will get the -3y by itself.

-3y < -18

After this, divide by -3 on both sides to solve for y.

-3y < -18
—— ——
-3 -3

When you divide by a negative in an inequality, remember to flip the inequality sign.

y > 6

There you go!
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Sam wants to buy 8 pencils and 6 pens, which cost a total of $8.50. He realizes he doesn't have enough cash and instead takes on
Diano4ka-milaya [45]
X = pencils, y = pens

8x + 6y = 8.50
4x + 4y = 5.....multiply by -2
----------------
8x + 6y = 8.50
-8x - 8y = -10 (result of multiplying by -2)
-----------------add
-2y = - 1.50
y = -1.50 / -2
y = 0.75 <=== pens cost 0.75

4x + 4y = 5
4x + 4(0.75) = 5
4x + 3 = 5
4x = 5 - 3
4x = 2
x = 2/4
x = 0.50 <== pencils cost 0.50
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A city's population is currently 100,000. If the population doubles every 80 years, what will the population be 160 years from n
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Answer:

Step-by-step explanation:

100,000 doubles to 200,000 in 80 years then 400,000 in 80 more years

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Step-by-step explanation:

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If f(x) = 2x - 8 and g(x) = x4, what is (gºf)(5)?​
Readme [11.4K]

Answer:

(g°f)x =16 when x = 5

Step-by-step explanation:

It might be easier to understand if you wrote this the other acceptable way.

g(x) = x^4

f(x) = 2x - 8

g(f(x))  means that in g(x) wherever you see and x you put f(x)

g(f(x)) = (f(x) ) ^ 4 Now put in the general value for f(x)

g(2x - 8) = (2x - 8)^4

You really don't want to expand this (although it would give you the right answer eventually).

g(2*5 - 8) = (2 * 5 - 8)^4

g(2*5 - 8) = (10 - 8)^4

g(2*5 - 8) = 2^4

Answer 16

8 0
3 years ago
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