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3 years ago

Two ways to write a algebraic expression of n-5

Mathematics

2 answers:

Advocard [28]3 years ago

6 0

Two ways to write a algebraic expression of n-5:

n + (-5)
or
-5 + n
hope it helps

deff fn [24]3 years ago

5 0

-5 + n is another way to write the expression.

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A boy's age in ten year time will be four times his age five years ago. Find his present age.

Katyanochek1 [597]

Answer:

He is ten.

Step-by-step explanation:

10 yrs old. Go ahead 10 yrs to make 20. Which is four times as much as five years old. (Which is 5 years before 10)

Hope this helps! :)

8 0

2 years ago

Elimination

SVETLANKA909090 [29]

2x - 4y + 1z = 11 ⇒ 2x - 4y + 1z = 11
1x + 2y + 3z = 9 ⇒ 1x + 2y + 3z = 9
3x + 5z = 12 1x - 2y - 2z = 2
 1x - 2y - 2z = 2
2x - 4y + 1z = 11 -2x + 2y - 2z = -3
1x + 2y + 3z = 9 ⇒ 1x + 2y + 3z = 9 x - 4z = 1
3x + 5z = 12 ⇒ 3x + 5z = 12 x - 4z + 4z = 1 + 4z
 -2x + 2y - 2z = -3 x = 1 + 4z
 1 + 4z - 2y - 2z = 2
 1 - 2y + 4z - 2z = 2
 1 - 2y + 2z = 2
 - 1 - 1
 -2y + 2z = 1
 -2y + 2z - 2z = 1 - 2z
 -2y = 1 - 2z
 -2 -2
 y = -0.5 + z
 x + 2(-0.5 + z) - 2z = 2
 x - 1 + z - 2z + 2 = 2
 x - 1 + z = 2
 + 1 + 1
 x + z = 3
 x - x + z = 3 - x
 z = 3 - x

4 0

3 years ago

3. use the law of exponents to evaluate (1/x) ^ -n when x= 7 and n= 2

emmainna [20.7K]

D on both ...................

8 0

3 years ago

Please help me first answer gets brainliest please dont play around

Crazy boy [7]

Answer:

8b- 13 6/7

Step-by-step explanation:

A product of 8 and b just means 8 x b or 8b.

13 6/7 less than that product means subtraction.

Therefore, it would be 8b - $13\frac{6}{7}$

6 0

2 years ago

Read 2 more answers

I need answers fast plsss

Nonamiya [84]

Answer:

1/6

Step-by-step explanation:

the form you're using is slope-intercept. That is

y=mx+b

where y= y coordinate

m=slope

x= x coordinate

and b= y intercept

so, m in that equation is 1/6, so the slope is 1/6

Hope this helps!

6 0

2 years ago