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agasfer [191]
3 years ago
11

Simplify -5(3m2 + 7n2) + 8n2

Mathematics
2 answers:
Blababa [14]3 years ago
6 0

Answer:

\boxed{\red{=  - 3(5 {m}^{2}   + 9 {n}^{2} )}}

Step-by-step explanation:

- 5(3 {m}^{2}  + 7 {n}^{2} ) + 8 {n}^{2}  \\  - 15 {m}^{2}  - 35 {n}^{2}  + 8 {n}^{2}  \\  =  - 15 {m}^{2}  - 27 {n}^{2}  \\  =  - 3(5 {m}^{2}   + 9 {n}^{2} )

son4ous [18]3 years ago
5 0

Answer:

<h3>-15m² - 27n²</h3>

Step-by-step explanation:

-5(3m² + 7n²) + 8n²

Expand brackets.

-15m² + -35n² + 8n²

Combine like terms.

-15m² + -27n²

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Do the ratios 8/16 and 2/4 form a proportion
notsponge [240]

Answer:

Step-by-step explanation:

8/16=8:16

2/4=2:4

7 0
3 years ago
M-7&lt;6
Novosadov [1.4K]

it is between 1 and 3 but i would go for 3, if choose all that would choose 1,2,3

5 0
3 years ago
Jeff's mother gave him money. he used an equal amount of money each day. at the end of the 7th day, he was left with 1/4 of how
skelet666 [1.2K]

Jeff received 280$ from his mother

Such questions are the simplest as it needs you to just write the conditions accordingly which then simplifies and provides you the answer.

This question can be solved using two tricks which are shown below:-

Trick  1 :

1 – 1/4 = 3/4 (used for the 1st 7 days)

1/4 – 410 (used for 8th and 9th days)

(3/4)/7 ——- (1/4 – 10)/2

(3/4) x (2/7) = 3/14 ——- (1/4 – 10)

1/4 – 3/14 = (7 – 6)/28 = 1/28 ——- 10

28/28 ——- 10 x 28 =$ 280

Trick 2 :

7 days ——- 3/4

1 day ——- 3/28

2 days ——- 6/28

6/28 ——- (1/4 – 10) = 7/28 – 410

1/28 ——- 10

28/28 ——- 10 x 28 = $280

Thus Jeff received 280$ from his mother.

Learn more about simple math here :

brainly.com/question/23678

#SPJ4

4 0
2 years ago
Find the least common multiple of 20, 4, and 5
Salsk061 [2.6K]

Answer:

LCM = 20

Step-by-step explanation:

You need to make everything into 20. Luckily, 4X5 is 20 and vise versa.

4 0
3 years ago
What is the slope of the line joining (8,8) and (12, 6)?
Anna71 [15]

Answer:

\huge \boxed{ \boxed{ -  \frac{1}{2} }}

Step-by-step explanation:

The slope of a line given two points can be found by using the formula

m =  \frac{ y_2 - y _ 1}{x_ 2 - x_ 1} \\

From the question we have

m =  \frac{6 - 8}{12 - 8}  =  -  \frac{2}{4}  =  -  \frac{1}{2}  \\

We have the final answer as

-  \frac{1}{2}  \\

Hope this helps you

6 0
3 years ago
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