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3 years ago

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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Yuki888 [10]

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3 years ago

What is the ratio and diameter of the following Circle 4.2 cm

gladu [14]

Answer:

4/2 is the ratio and the diameter is 2

Step-by-step explanation:

4/2 is a fraction and 2 is when you divide 4/2. Correct me if I am wrong.

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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.

55x - 40x = 15x

160 / 15 = 15 / 15x

This means 160/15 = x, or is equal to

10 2/3

4 0

3 years ago

Read 2 more answers

I am trying my level best to understand graph so far , how to draw a graph of composite function ?

stiks02 [169]

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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.

Sample mean:

$\bar{x}=32$

Population mean:

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

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

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

$z=1.96$ $\text{Error}=\pm1.96\times\frac{10.4987}{\sqrt[]{10}}$ $\text{Error}=\pm6.5072$ $\text{Error}=\pm6.5$

4 0

1 year ago