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never [62]
3 years ago
8

the sum of twice a number and 15 less than the number is the same as the difference between-7 and the number. what is the number

Mathematics
1 answer:
Nuetrik [128]3 years ago
4 0

Let's say, the number is x.

2x + 15 ≤ (-7 - x )

2x + x ≤ -7 - 15

3x ≤ -23

x ≤ -23 / 3

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If y varies inversely as x, an d y = 12 when x = 6, what is K, the variation constant? A. 144 B. 72 C. 2 D. 1/3
Arlecino [84]
B is correct my friend
7 0
3 years ago
In the system -12c+3d=6 and -3c +6d=-9, which expression could you use for substitution
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3 0
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Ieda and Thanh both offer piano lessons. Ieda charges an initial fee of $8.50 and an hourly rate of $11.00. Thanh charges an ini
Trava [24]
The price for each instructor will be the same at 3 hours. How I determined this answer:

First off, you need to add the initial price and hourly price for each person together, so you already know how much it will cost for 1 hour, including the initial fee. Here's how you do it:

Ieda: $11.00 (hourly price) + $8.50 (initial fee) = $19.50 (for 1 hour)

Thanh: $10.50 (hourly price) + $10.00 (initial fee) = $20.50 (for 1 hour)

Now that you have the price for 1 hour including the initial fee, now you need to find the price for each hour after that. Here's how I did that:

I created a graph that looked like this:

Hours:       1                 2                  3               
Ieda:      19.50          30.50         41.50
Thanh:   20.50          31.00         41.50

Here's how I figured out the price for each hour:

Ieda:

Hour 1 (including initial price):
            $11.00 + $8.50 = $19.50
Hour 2 (excluding initial price): Only add the hourly price after Hour 1!
            $19.50 + $11.00 = $30.50 
Hour 3 (excluding initial price):
            $30.50 + $11.00 = $41.50

Thanh:

Hour 1 (including initial price):
            $10.50 + $10.00 = $20.50
Hour 2 (excluding initial price):
            $20.50 + $10.50 = $31.00
Hour 3 (excluding initial price):
            $31.00 + $10.50 = $41.50

So, looking at the graph, their prices are the same once each instruction reaches 3 hours. ($41.50)

I hope I was able to help you! :)
5 0
3 years ago
Read 2 more answers
Please help! 50 points
Alja [10]

Answer:

<em>See attached</em>

<u>x- intercepts</u>

  • (-2, 0), (-1, 0), (1, 0)

<u>y- intercept</u>

  • (0, -2)

4 0
3 years ago
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lilavasa [31]
X: represents how many weeks
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So the recursive formula would be: 100 - XN = B
5 0
3 years ago
Read 2 more answers
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