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Dimas [21]
3 years ago
7

Find the value of 21 - 18 ÷ 3 · 2. 2 9 18

Mathematics
1 answer:
maks197457 [2]3 years ago
8 0
Order of operations (PEMDAS):
21 - 18 <span>/ 3 * 2
let's add some parenthesese to make it easier to see:
21 - (18 / 3 * 2)
multiplication and division are associative
also: 18 / 3 = 18 * (1/3)
21 - (18 * (1/3) * 2)

21 - (6*2) or 21 - (36 * (1/3)) or 21 - (18 * (2/3))

21 - 12

9
</span> 
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How do you simplify: 5(8 + 7) ?<br><br> a. 75<br> b. 65<br> c. 47<br> d. 15
tia_tia [17]

Answer:

C. 47

Step-by-step explanation:

5(8 + 7)

Expand the brackets. Brackets mean to multiply.

5(8 + 7)

5 * 8 + 7

= 40 + 7

= 47

8 0
3 years ago
Read 2 more answers
1) Sandra saves 12% of her salary for retirement. This year her salary was $3000 more than in the previous year, and she saved $
svp [43]
Given:
savings 12% of her salary.
savings $4,200
This year's salary: x + 3,000
Last year's salary: x

4,200 represents 12% of her salary.
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x = 35,000 - 3,000
x = 32,000  her salary last year.
3 0
3 years ago
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find the distance of CD if the coordinates of C are (-4,11) and D are ( -3,4) Express your answer in simplest radical form.
Aloiza [94]

Step-by-step explanation:

it's not clear but I tried

4 0
2 years ago
-v + 5 + 6v = 1 + 5v + 3
Vedmedyk [2.9K]
Combine your like terms: 5v + 5 = 5v +4
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8 0
3 years ago
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to find the product 3 3/8 * 4 1/9.tara rewrote 3 3/8 as 17/8 amd 4 1/9 as 13/9. she multiplies the fractions to find the product
Ymorist [56]

Answer:

The error Tara made is she rewrote incorrectly 3 3/8 as 17/8 and 4 1/9 as 13/9,

the corrected number can be rewrote as 3 3/8 as 27/8 and 4 1/9 as 37/9.

Step-by-step explanation:

To find the Product of:

3\frac{3}{8}\times 4\frac{1}{9}

The Number can be rewrote as,

\frac{3\times8+3}{8}\times \frac{4\times9+1}{9}\\\\\frac{24+3}{8}\times \frac{36+1}{9}\\\\\frac{27}{8}\times \frac{37}{9}

Tara made error here she rewrote the number incorrectly 3 3/8 as 17/8 amd 4 1/9 as 13/9.

Now multiplying the fraction we get

\frac{999}{72}

Because she rewrote incorrectly which led her answer to multiplication of fraction, the product too was incorrect which she wrote as 221/72.

3 0
3 years ago
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