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4 years ago

when I add or subtract fractions first I must convert the denominators so they are common. Then I can add or subtract the?

Mathematics

2 answers:

Delicious77 [7]4 years ago

6 0

Yes and the denominator will stay the same...for example: 8/10 + 1/10 = 9/10

tia_tia [17]4 years ago

3 0

Numerators.

Remember you have to convert the numerators as well.

Example:- 2/3 + 1/6

LCD = 6

2/3 becomes 2/3 * 2/2 = 4/6

4/6 + 1/6 = 5/6.

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What equation represents the line that passes through points (1.-5) and (3 -17)?

zzz [600]

ALL LINES CAN BE REPRESENTED IN THE FORM $f(x) = ax+b$ .

We know that:

$f(1) = -5 \implies a\cdot(1)+b = -5 \implies a+b = -5$

and

$f(3) = -17 \implies a\cdot(3) +b = -17 \implies 3a+b = 17$

Observe that:

$3a+b = 2a+a+b = 2a+(a+b)$

So:

$2a+(a+b) =-17$

But we know that $a+b = -5$ , so:

$2a+(a+b) =-17$

$2a+(-5) = -17$

$2a = -12$

$a = -6$

Since:

$a+b = -5$

$(-6)+b = -5$

$b = 1$

So the line is:

$f(x) = 1-6x$

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3 years ago

In a school library, 7/12 of the books are about science. Of the science books, 2/3 are about mammals. What fraction of the tota

Pavel [41]

The fraction of the total books about mammals is 7/18

Let the total number of books in the school be 1 whole , ie 12/12( since we are dealing with fractions)

Number of science books =7/12

Number of mammals books =2/3 of science books

=2/3 x 7/12=14/36 = 7/18

Since the total books are 12/12 which is also =1 whole

Then the fraction of total books that are about mammals are 7/18 x 1 whole =7/18

See related answer here: brainly.com/question/18443368

4 0

2 years ago

Allisa [31]

Answer:

t= 0

Step-by-step explanation:

Using the rules of logarithms

log x + log y = log(xy)

$log_{b}$ 1 = 0

Given

$log_{x}$ a + $log_{x}$ $\frac{1}{a}$ = t ,then

$log_{x}$ (a × $\frac{1}{a}$ ) = t

$log_{x}$ 1 = t , thus

t = 0

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ElenaW [278]

Answer:

The answer is " $4 \cdot 7$ ".

Step-by-step explanation:

In the question the total given value =4(x+7). if we add the value it will be 11 but if we multiply the value it is equal to $4 \cdot 7$ .

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3 years ago

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ryzh [129]

(a) She spends 5/12 of the day awake at home

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