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Anastaziya [24]
3 years ago
12

Johnny has graded 20% of his 150 students papers how many papers does he still need to finish grading ?

Mathematics
2 answers:
marin [14]3 years ago
7 0
First change 20% to a decimal 20% = .20
Then you multiply 150x.20=30 to find out how many papers he has graded so far. 
Then subtract 30 from 150 to find out how many papers he still needs to grade.
150 - 30 = 120
So he has 120 papers left to grade.
LiRa [457]3 years ago
4 0
The correct answer is 120 papers.
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If f(x)= 9^x then prove that f(m+n+p) = f(m).f(n).f(p)​
kakasveta [241]

Answer:

f(x)=9^(x)

Plugging in m+n+p=x, we have

f(m+n+p) = 9^(m+n+p)

Using the properties of exponential a^(b+c) = a^b*a^c, we have

f(m+n+p) = 9^(m)*9^(n)*9^(p)

f(m+n+p) = f(m)*f(n)*f(p)

4 0
3 years ago
A Student writes "the sum of 7 times a number n plus 5"to describe the expression 7(n+5) explain the error
ziro4ka [17]
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6 0
3 years ago
Use the distributive property -5 {x + 4} + -3x + -9x + -7
grin007 [14]

Answer:

-17x - 27

Step-by-step explanation:

Distributive property is the multiplication of the number outside the parenthesis and the ones inside.

-5(x + 4) + -3x + -9x + -7

-5x - 20 + -3x + -9x + -7

Combine like terms:

-5x - 20 + -3x + -9x + -7

-5x +-3x

 -8x + -9x

      -17x

-17x - 20 + -7

     -20 + -7

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The answer is -17x - 27

Hope this helped.

8 0
3 years ago
How do you decide which number to subtract from both sides
Lorico [155]
The biggest number is what you subtract first from the smaller number :)
8 0
3 years ago
Suppose the function H(t) = 8.5sin(0.017t – 1.35) + 12 models the hours of sunlight for a town in Alaska, where t = 1 is the fir
Vitek1552 [10]

Answer:

  3.5 to 20.5 hours

Step-by-step explanation:

The range of the sine function is -1 to 1, so the range of H will be ...

  -8.5 +12 = 3.5

to

  8.5 +12 = 20.5

The length of the day varies by 17 hours from 3.5 hours to 20.5 hours.

8 0
3 years ago
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