Why do fractions need to have a common denominator before you add or subtract them?

1 answer:

5 0

Fractions need common denominator to add or subtract them because without denominators a fraction is not a fraction, it is a whole number
Example - 2/8 is a fraction
but 2 is not a fraction

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Are 5(2x-y) and 15x-5y equivalent expressions?

krek1111 [17]

No, they are not equivalent.

5(2x - y) = 10x - 5y and it is not equal to 15x - 5y.

(using distribution property)

6 0

3 years ago

What is 12a equal to if 4a plus 6b = 10 and 2a-4b=12?

hram777 [196]

12a=x
4a+6b=10
2a+3b=5
2a-4b=12
a-2b=6
2a+3b+1=a-2b
a+5b+1=0
a=-1-5b

2(-1-5b)+3b=5
-2-10b+3b=5
-2-7b=5
-7b=7
7b=-7
b=-1

-1-5*-1=a
-1+5=a
4=a

4*12=48
12a=48

Hope this helps :)

3 0

2 years ago

Read 2 more answers

WHICH IS THE CORRECT ANSWER ?!

alex41 [277]

Answer:

Step-by-step explanation:

when you calculate in calculator putting all given values it will give 17/8

hope you liked it

8 0

2 years ago

6th grade math (answer both) .... :D

LekaFEV [45]

Answer:

Question 2: Option B

Step-by-step explanation:

The number of ounces and the total price for yogurt cup A is not stated, therefore, I can not answer question 1 properly.

<h3>For question 2:</h3><h3 />

Unit rate formula for price is: $\frac{price}{quantity}$

32 ounces of yogurt sell for 1.62.

So:

$\frac{1.62}{32} =0.050625$

0.050625 ≈ 0.05

<em>Option B should be the best answer. </em>

7 0

2 years ago

Explain in your own words what domain and range mean

a_sh-v [17]

A domain is an input that you put in an equation(x). A range is an output (y) that is the result of a certain input.

Hope this helps and please mark as brainliest!

3 0

3 years ago

Read 2 more answers