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3 years ago

The sum of two numbers is 18 their difference is 8

Mathematics

2 answers:

Anna007 [38]3 years ago

4 0

When we write out the system of equations, we will get:

x+y=18

x-y=8

We can then use elimination to get just one variable.

x+y=18

+x-y= 8

Which gives us: 2x=26

We then divide by 2 and get: x=13

We next plug that into one of the two equations and solve for the other variable: (13)+y=18

We subtract 13 from both sides and get: y=5

So the two numbers are 13 and 5.

~ I hope this helped, and I would appreciate Brainliest. ♡ ~ ( I request this to all the lengthy answers I give ! )

hram777 [196]3 years ago

3 0

Answer:

13 and 5

Step-by-step explanation:

x+y=18

x-y=8

_____

2x=26

x=13

So the first number must be 13

13+y=18

y=5

And the second number must be 5

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help solving inequalities true or false (middle school) first person to answer i’ll give brainliest please!!!

dalvyx [7]

Answer:

aef true and bcd false

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Step-by-step explanation:

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3 years ago

The TI-83/84 Plus calculator can be used to generate random data from a normally distributed population. The command randNorm(10

postnew [5]

Answer:

99% confidence interval for the mean value from the random number generator is a lower limit of 85.87 and an upper limit of 110.93.

Step-by-step explanation:

Confidence interval = mean +/- margin of error (E)

mean = 98.4

sd = 16.3

n = 15

degree of freedom (df) = n - 1 = 15 - 1 = 14

confidence level (C) = 99% = 0.99

significance level = 1 - C = 1 - 0.99 = 0.01 = 1%

t-value corresponding to 14 df and 1% significance level is 2.977.

E = t×sd/√n = 2.977×16.3/√15 = 12.53

Lower limit = mean - E = 98.4 - 12.53 = 85.87

Upper limit = mean + E = 98.4 + 12.53 = 110.93

99% confidence interval for the mean is between 85.87 and 110.93

3 0

3 years ago

A line contains the points (-26, -37) and (32, -61)

Slav-nsk [51]

The slope of line through given points is -12/29

Step-by-step explanation:

Given points are:

(-26, -37) and (32, -61)

Let

(x1,y1) =(-26, -37)

And

(x2,y2) = (32, -61)

Slope (steepness) of a line, denoted by m, is given by the formula

$m = \frac{y_2-y_1}{x_2-x_1}$

Putting the values

$m = \frac{-61-(-37)}{32-(-26)}\\\\=\frac{-61+37}{32+26}\\\\=\frac{-24}{58}\\\\=-\frac{12}{29}$

Hence,

The slope of line through given points is -12/29

Keywords: Slope, line segment

Learn more about slope at:

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5 0

3 years ago

HELP PLEASE HELP!!!!

Ronch [10]

Answer:

a=12 b=9

Step-by-step explanation:

u can substitute 3/4a in for b in a+b=12 since it is equal to b, giving you

a+3/4a=21

a=4/4a

4/4a+3/4a=21

7/4a=21

4/7(7/4a=21)

a=12

plug in 12 for a in either equation

b=3/4*12

b=9

(21=12+b) -12

9=b

7 0

2 years ago

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Rainbow [258]

The statement that best explains the effects of specializations in the US are:

The Midwest became a major grain-growing region of the United States. (Option B)
The north became dependent on workers who migrated from the South. (Option C)
The northeast became a center for manufacturing and industry. (Option F)

<h3>What is specialization in economics?</h3>

Specialization refers to the act of strategy of focusing on one's area of strength.

For a country, that would mean focusing on the production of goods and services in which it has a higher degree of advantage or efficiency.

Learn more about specialization in the US at:
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5 0

2 years ago