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3 years ago

Simplify: (3n^2-7n)+(7n^2+n+1)

Mathematics

1 answer:

arlik [135]3 years ago

8 0

Answer: 21n^4 -46n^3 -4n^2 +7n

Step-by-step explanation:

21n^4 +3n^3 +3n^2 -49n^3 -7n^2 +7n =

21n^4 -46n^3 -4n^2 +7n

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Which pair of changes does not involve forming or breaking chemical bonds? Question 4 options: burning and melting rusting and c

umka2103 [35]

Answer:

boiling and melting

Step-by-step explanation:

7 0

4 years ago

phil ate three less than twice as many pancakes as sara. together they combined to eat 15 pancakes. How many pancakes did each e

Levart [38]

Answer:

Let x represents the Sara eat pancake and y represents the Phil eat the pancake.

As per the statement:

Phil ate three less than twice as many pancakes as Sara.

"Twice as many pancake as Sara" means 2x

"three less than twice as many pancakes as Sara" means 2x -3

⇒ $y = 2x-3$ .....[1]

It is also given that together they combined to eat 15 pancakes.

⇒ $x+y =15$ .....[2]

Substitute equation [1] into [2] we get;

$x+2x-3 = 15$

Combine like terms;

3x-3 =15

Add 3 to both sides we get;

3x = 18

Divide both sides by 3 we get;

x = 6

Substitute the value of x in [1] we get;

y = 2(6)-3 = 12-3 =9

y = 9

Therefore, the pancakes did each eat are;

Sara eat pancake = 6 and Phil eat pancake = 9

8 0

3 years ago

I'll mark the best or the first as brainliest.

FinnZ [79.3K]

Answer:

Here the error is 

 $\pi {r}^{2}$ 

It should have been ,

 $2\pi {r}^{2}$ 

Step-by-step explanation:

Corrected formula:

 $2\pi {r}^{2} + 2\pi rh$ 

 $= 2\pi ({5}^{2}) + 2\pi(5)(10.6)$ 

 $= 50\pi + 106\pi$ 

 $= 156\pi$ 

 $= 489.84 {yd}^{2}$ 

 $approx . \: 489.8 {yd}^{2} (ans)$ 

6 0

3 years ago

Lisa made a big apple pie for dinner. Each guest wanted 1/8th of the pie. How many guests could lisa serve?

Tresset [83]

Answer: she could serve 8 people

Step-by-step explanation:

each guest wanted 1/8 so first she would have to make it into 8 equal parts then give each guest 1 slice of pie.

6 0

3 years ago

please help please help please please please please please please please please please please please please please please please

7nadin3 [17]

Answer:
1) -10^3 (-10 to the power of 3)
2) r^5 (pie to the power of 5)
3) 1/2^2 + x^3 (1/2 to the power of 2 + x to the power of 3)

3 0

3 years ago