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Elanso [62]
4 years ago
12

Seven less than a number is fifteen

Mathematics
2 answers:
DedPeter [7]4 years ago
7 0

7-x=15

7-(-8)=15

what we have to do in order to solve this is change the 2 subtraction signs into a addition sign because a negative plus a negative makes a positive.

Juliette [100K]4 years ago
6 0
Actually, its the other way around, its not 7-x=15 but
x - 7 = 15 \\ x = 15 + 7 \\ x = 22
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The cost C (in dollars) of building a house is related to the number k of carpenters used and the number e of electricians used
riadik2000 [5.3K]
C = 15000 + 50k^2 + 60e^2 \Rightarrow \\
\frac{dC}{de} = \frac{d}{de} 50k^2  + \frac{d}{de} 60e^2 \Rightarrow \\
\frac{dC}{de} =  100k\frac{dk}{de}  +  120e\\
Cost\ of\ house\ is\ fixed\ so\ \frac{dC}{de} = 0 \\
0 = 100k\frac{dk}{de}  +  120e\ \Rightarrow\ -120e = 100k\frac{dk}{de}  \ \Righarrow \\ \frac{dk}{de} = -\frac{6e}{5k}  \\



find k when e = 15

100000 = 15000 + 50k^2 + 60(15)^2 \Rightarrow k = \sqrt{1430}

\frac{dk}{de} = -\frac{6e}{5k} = -\frac{6(15)}{5\sqrt{1430}} = -0.476

inst rate of carpenters with 15 <span>electricians:</span> decreasing at 0.476 carpenters per electrician

7 0
3 years ago
Plz no links just give the answer and how you got it plsss. A circular hot spring has a diameter of 106 meters. Over time, the d
Nookie1986 [14]

Answer:

The area decreases by 1155.52 square meters

Step-by-step explanation:

a = pi * r ^ 2

d = 2 * r

r = d / 2

r = 96/2

r = 48

a1 = 3.14 * 48 ^ 2

a1 = 7234.56 square meters.

r = 88/2

r = 44

a2 = 3.14 * 44 ^ 2

a2 = 6079.04 square meters.

now we calculate the difference

a1 - a2 = 7234.56 - 6079.04

= 1155.52 square meters

7 0
3 years ago
What is the mode for the set of data shown below?45, 23, 16, 78, 24, 39, 95, 23, 25, 93, 49, 45, 83, 90, 14, 23
Ganezh [65]
The mode is the most frequently occurring value, so the answer is 45
3 0
4 years ago
Read 2 more answers
A game is being played with two players. There are 21 balloons and the player who pops the last balloon wins. One or two can be
34kurt

Answer:

  be the second player, and always leave a multiple of 3 balloons

Step-by-step explanation:

In order to win, a player must force the other player to leave one or two balloons. To do that, the winning player must leave one more balloon than the maximum number that can be popped. That is, the winner will be the player who leaves 3 balloons,

Working backward, we find that the winner must leave a multiple of 3 after each turn. Since the starting number is a multiple of 3, the first player must lose if the second player plays optimally.

The winning strategy is ...

  • be the second player
  • always leave a multiple of 3 balloons.
4 0
3 years ago
Isolate the x <br>3x+3y=-3
kirza4 [7]

Answer:

Step-by-step explanation:

3x + 3y = -3    given

3x = -3y - 3   subtract 3y from both sides

x = -y -1        divide everything by 3

hope this helps <3

3 0
3 years ago
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