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2 years ago

SOMEONE PLEASE HELP ME THIS IS DUE IN 30 min

Mathematics

1 answer:

Ksivusya [100]2 years ago

8 0

Answer:

its 560 meters because you do 10 times 14 which gives you 140 then you multiply 140 by 4 and you get 560

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(5n2 – 4nm - 9m²) + (7n2 + 4nm +8m²) =

Flauer [41]

Answer:

$\left(5n^2-4nm-9m^2\right)+\left(7n^2+4nm+8m^2\right)=12n^2-m^2$

Step-by-step explanation:

Given the expression

$\left(5n^2\:-\:4nm\:-\:9m^2\right)\:+\:\left(7n^2\:+\:4nm\:+8m^2\right)$

Remove parentheses: (a) = a

$=5n^2-4nm-9m^2+7n^2+4nm+8m^2$

Group like terms

$=5n^2+7n^2-4nm+4nm-9m^2+8m^2$

Add similar elements: $5n^2+7n^2=12n^2$

$=12n^2-4nm+4nm-9m^2+8m^2$

Add similar elements: $-4nm+4nm=0$

$=12n^2-9m^2+8m^2$

Add similar elements: $-9m^2+8m^2=-m^2$

$=12n^2-m^2$

Therefore, we conclude that:

$\left(5n^2-4nm-9m^2\right)+\left(7n^2+4nm+8m^2\right)=12n^2-m^2$

5 0

2 years ago

Mr. Pham wrote the equation below on the board.

Zielflug [23.3K]

Answer:

5.5

Step-by-step explanation:

Given:

18 -7x = -20.5

We can find x by subtracting 18, then dividing by the coefficient of x. (This is known as a 2-step equation.)

-7x = -38.5 . . . . . subtract 18 from both sides

x = -38.5/-7 = 5.5 . . . . .divide by -7

The value of x is 5.5.

8 0

3 years ago

Read 2 more answers

Factorise x squared plus 10x

sattari [20]

We know, factorisation is the process of writing a number or another mathematical object as a product of several factors, usually smaller or simpler objects of the same kind.

x² + 10x

Now we should take x common from both the terms.

= x (x + 10)

Answer:

x (x + 10)

Hope you could understand.

If you have any query, feel free to ask.

6 0

2 years ago

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A rental car company charges $69.72 per day to rent a car and $0.15 for every mile driven. Bella wants to rent a car, knowing th

sergiy2304 [10]

First we must how much she has to spend to do all the miles.

as each mile is 0.15 she needs 0.15 * 375 = 56.25 dollars.

Now the compagny charges 69.72 for each day. Let's call X numbers of days.

Then we have to solve :

69.72 X + 56.25 = 470

69.72 X = 470 -56.25

69.72 X = 413.75

X = 413.75 / 69.72

X = 5.93 ...

As the compagny charges whole days, she can keep it only 5 days.

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2 years ago

At nine months of age, a baby elephant can weigh 700 pounds. If this is 4 times the baby elephants birth weight, how many pounds

san4es73 [151]

Answer:

At birth, the baby elephant weighed 175 lbs.

Step-by-step explanation:

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2 years ago

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