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Step2247 [10]
3 years ago
7

An easy question all wrong or unhelpful or no-work answers will be reported.

Mathematics
1 answer:
miss Akunina [59]3 years ago
6 0
Elimination:

7x - 3y = 20
5x + 3y = 16
(add)
12x = 36
÷ 12
x = 3

(5 × 3) + 3y = 16
15 + 3y = 16
- 15
3y = 1
÷ 3
y = 1/3

Substitution:

5x + 3y = 16
- 3y
5x = 16 - 3y
÷ 5
x = 3.2 - 0.6y

5(3.2 - 0.6y) + 3y = 16
16 - 3y + 3y = 16
16  = 16
- 16
6y = 0
÷ 6
y = 0

Sorry the substitution messed up for some reason, I'll fix it after I've answered the other question

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Anyone ????!!!! know ???!!!
aniked [119]

Answer:

it would be 1/6 2

Step-by-step explanation:

the reason is because when you multiply 1/6 by 1/6 you get 1/36

5 0
3 years ago
Evaluate the expression x to the 5th power over x to the 2nd power when x = 2
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Answer:

8

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Step-by-step explanation:

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8 0
3 years ago
3/4 of the students in a classroom are girls. If there are ten boys in the class, how many total students are there?
Arte-miy333 [17]

Answer:

40 students total

Step-by-step explanation:

Let s represent the total number of students.  Then (3/4)s are girls and (1/4)s are boys.  Using the info on boys, (1/4)s = 10.  Thus, s = 40 (students).

Check:  Is (1/4)(40) = 10?  Yes.

             Is (3/4)(40) = 30?  Yes

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3 0
3 years ago
2. The ratio of white marbles to blue marbles is equal to 2:3. There are more than 20
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Answer:

24 white marbles, 36 black marbles

Step-by-step explanation:

System of Inequalities:

x + y > 20

2/5y + 3/5x > 20

solve first inequality for 'y':

y > 20 - x

Use substitution to solve for 'x':

2/5(20 - x) + 3/5x > 20

8 - 2/5x + 3/5x > 20

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x > 60

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3/5 of 60 = 36

6 0
3 years ago
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Sonbull [250]
The answer is 7 months.
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3 years ago
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