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3 years ago

What is the sum of 2/5 and 2/4?

2 answers:

4 0

Hello, Upschic23!
Sum means addition(+)
2/5+2/4
2/5+1/2 
4/10+5/10 
9/10 or .9
I hope this helps;)

olga2289 [7]3 years ago

4 0

The answer is
2/5 = 8/20 
2/4 = 10/20

18/20 NOT SIMPLIFIED or 9/10 SIMPLIFIED

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The sum of the deviations about the mean always equals _________.

Cloud [144]

It always equal 0
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4 years ago

Below is a list of test scores for the ninth grade math and science classes at Campbell High School:

saveliy_v [14]

Answer:

C. The mean is the best measure of central tendency for the math class.

Step-by-step explanation:

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3 years ago

Mileage tests are conducted for a particular model of automobile. If a 98% confidence interval with a margin of error of 1 mile

Llana [10]

Answer: 37

Step-by-step explanation:

Given : Significance level : $\alpha:1-0.98=0.02$

Critical value : $z_{\alpha/2}=z_{0.01}=2.33$

margin of error : E= 1 mile per gallon

Population standard deviation: $\sigma=2.6$ miles per gallon.

We know that when the population standard deviation is known then the formula to find the sample size is given by :

$n=(\dfrac{z_{\alpha/2}\times \sigma}{E})^2$

$n=(\dfrac{(2.33)\times 2.6}{1})^2=36.699364\approx37$ [Round to the next whole number.]

Hence, the required number of automobiles should be used in the test = 37

7 0

4 years ago

Find the least common multiple of x² + x – 12 and x² + 2x – 15.

belka [17]

The LCM is (x+4)(x-3)(x+5)

6 0

3 years ago

Read 2 more answers

Yuki has saved £100 and spends £22 on a present. Rosetta has saved £140 and spends £28 on a present. What percentage has each gi

grigory [225]

Answer:

yuki has spent 22 percent , Rosetta spent 20 percent

step by step explanation:

1) if £100=100percent

then £22=x percent

x=(22×100)/100=22 percent

2) if £140=100 percent

then £28= x percent

x=(28×100)/140

x=2800/140

x=20 percent

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3 years ago