3 years ago

Simplify the following expression: 21(x-4)+2 A- 21x - 2 B- 107x C- 21x-82 D- 27x

Mathematics

1 answer:

stealth61 [152]3 years ago

6 0

It's C I'm taking the test right now.

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Simplify the following expression.

HACTEHA [7]

Remember that exponentioal rule
x^m times x^n=x^(m+n)
therefor
7^4 times 7^-6=7^(4-6)=7^(-2)
remember the other rule
x^-m=1/(x^m) so
7^-2=1/(7^2)=1/49
answe ris A

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3 years ago

Is 90 integers or rational Number

Natasha_Volkova [10]

90 is a rational number

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2x+5y=60 <br> 2x-5y=-20<br><br><br> Please show work!

sergejj [24]

(2x+5y=60)
- (2x-5y=-20)
-------------------
10y=80
y=8

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4 years ago

Will spent $3.75 for 3 pounds of granola. What is his unit rate in dollars per pound?

Lady_Fox [76]

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3 years ago

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A high school class consists of 7 seniors, 10 juniors, 12 sophomores, and 11 freshmen. Exactly 4 of the juniors are female,

jekas [21]

Answer:

1/13

Step-by-step explanation:

There exactly 7 seniors 10 Juniors, 12 sophomores and 11 freshman

in which 4 of the juniors are Female , and exactly 2 of the sophomores are male. Therefore,

10-4= 6 juniors are male

12-2 = 10 female sophomores

Total = 7+10+12+11= 40 students

P(male junior then female soph.)= $\frac{6}{40}\times\frac{10}{39}= \frac{1}{26}$

P(female soph then male junior)= $\frac{10}{40}\times\frac{6}{39}= \frac{1}{26}$

Therefore the final answer will be = 1/26 +1/26= 1/13

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3 years ago