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My name is Ann [436]
3 years ago
5

What is 4 over 8+ 2 over 8+ 2 over 4?

Mathematics
2 answers:
natita [175]3 years ago
6 0
= 4/8 + 2/8 + 2/4
= 2/4 + 1/4 + 2/4
= 5/4
Lostsunrise [7]3 years ago
3 0
You need LCD or the least common denominator. For 4 over 8 and 2 over 8 have the same denominators except for 2 over 4. You need to ask yourself what times 4 equals to 8? 4 times 2 equals to 8, so multiply 4x2 for the denominator and for the numerator multiply 2x2. Whatever you do to the denominator you have to do the same thing to the numerator. You multiplied 4x2 for the denominator and 2x2 for the numerator and now your fraction is 4 over 8. Now add 4 over 8+ 4 over 8 which is 8 over 8 or 1. Now add 1+ 2 over 8 which is 1 2/8. If you simplify 1 2/8 it will become 1 1/4.

Hope that helped:D
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In a certain city of several million people, 7.7% of the adults are unemployed. If a random sample of 300 adults in this city is
Lilit [14]

Answer: 0.2643

Step-by-step explanation:

Given : The proportion of  adults are unemployed : p=0.077

The sample size = 300

By suing normal approximation to the binomial , we have

\mu=np=300\times0.077=23.1

\sigma=\sqrt{np(1-p)}=\sqrt{300\times0.077(1-0.077)}\\\\=4.61749932323\approx4.62

Now, using formula z=\dfrac{x-\mu}{\sigma}, the z-value corresponding to 26 will be :-

z=\dfrac{26-23.1}{4.62}\approx0.63

Using standard distribution table for z , we have

P-value=P(z\geq0.63)=1-P(z

=1-0.7356527=0.2643473\approx0.2643

Hence, the probability that at least 26 in the sample are unemployed  =0.2643

6 0
3 years ago
Determine the number of real solutions of -2x^2+5x-3=0
Tema [17]

Answer:

Two distinct real solutions.

Step-by-step explanation:

Given the equation in the form ax^2+bx+c=0, you need to find the Discriminant with this formula:

D=b^2-4ac

For the equation -2x^2+5x-3=0 you can identify that:

a=-2\\b=5\\c=-3

Then, substituting these values into the formula, you get that the Discriminant is:

D=5^2-4(-2)(-3)

D=1

 Since D>0, then -2x^2+5x-3=0 has two distinct real solutions.

8 0
3 years ago
If −105 = −7 5 + 2 , then −2 =?
IgorLugansk [536]

Answer:

105 maybe

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Help me, cause I'm tuck
r-ruslan [8.4K]

Answer:

The answer would be 1.33 x 10^{4}

Step-by-step

1.28 x 10^{4} = 12800

5 x 10^{2} = 500

12800 + 500 = 13300

13300 = 1.33 x 10^{4} in scientific notation

Hope this helps:)

Sorry, I got the wrong answer earlier but I fixed it:)

8 0
3 years ago
If 75% of an iceberg's height is hidden below the surface of the water, what is the total height of
Illusion [34]

Answer:

1800

Step-by-step explanation:

8 0
2 years ago
Read 2 more answers
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