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natali 33 [55]
3 years ago
8

Seven times a number plus three times another number equals -1 the sum of two numbers is -3 what are the numbers? 25 points!!

Mathematics
1 answer:
Reptile [31]3 years ago
5 0
7x+3y=-1
x+y=-3

8x+4y=-4
2x+y=-1
y=-1-2x

x+y=-3
x-1-2x=-3
-x=-2
x=2
y=-1-2*2=-1-4=-5
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3 years ago
What is the ratio and diameter of the following Circle 4.2 cm ​
gladu [14]

Answer:

<em>4/2 </em>is the ratio and the diameter is <em>2</em>

Step-by-step explanation:

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8 0
3 years ago
Nicole wants to join a health club she is considering be-fit club which charges a one time initiation fee of $160 plus a $40 per
Gwar [14]

To find the answer, you have to set each one equal to each other.

(160 + 40x = 55x)

Now, you just solve for X.

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4 0
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7 0
3 years ago
The average commute times for employees of a large company is 32 minutes. The commute time of 10employees are 40, 31, 32, 16, 25
Ira Lisetskai [31]

Given:

40,31,32,16,25,35,22,53,23 and 33.

a)

Sample mean:

\bar{x}=32

Population mean:

\mu=\frac{\Sigma(x_i)}{n}_{}\mu=\frac{40+31+32+16+25+35+22+53+23+33}{10}\mu=\frac{310}{10}\mu=31

b)

\sigma=\sqrt[]{\frac{\Sigma(x-\mu)^2}{n-1}}\sigma=\sqrt[]{\frac{81+0+1+225+36+16+81+484+64+4}{10-1}}\sigma=\sqrt[]{\frac{992}{9}}\sigma=\frac{\sqrt[]{992}}{3}\sigma=10.4987\text{Error}=\pm z\times\frac{\sigma}{\sqrt[]{n}}

z value is not given so taken as 95% on confidence level

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4 0
1 year ago
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