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Flauer [41]
3 years ago
9

How do I solve number 10? I'm not sure if I did it right.

Mathematics
1 answer:
grandymaker [24]3 years ago
3 0
No, you did it right
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3 times a number is 54 less than the square of that number
Natasha2012 [34]

Answer:

-6

Step-by-step explanation:

3n = n² - 54

n² - 3n - 54 = 0

n² - 9n + 6n - 54 = 0

n(n - 9) + 6(n - 9) = 0

(n - 9)(n + 6) = 0

n = 9 , -6

hope this helps

8 0
2 years ago
Read 2 more answers
Which regular polygon will have the largest angle measure?
Bad White [126]
I did this in my math the other day and the answer is octagon 
i think of it as this 'the more angles there are the larger the angles'
i hope i helped

7 0
2 years ago
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The ratio of boys to girl in a certain class is 4:7. if there are 33 students in the class, how many of them are girls.
Elden [556K]
Your answer is that 21 are girls
7 0
3 years ago
Use the substitution method to solve the system of equations. Choose the correct ordered pair.
motikmotik
Ur gonna have to pick an equation and solve for a variable.

2x - 2y = 6
2x = 2y + 6 ...divide everything by 2 because u want x by itself
x = y + 3

now we sub y + 3 in for x in the other equation
14x - 2y = 78
14(y + 3) - 2y = 78...distribute thru the parenthesis
14y + 42 - 2y = 78...subtract 42 from both sides, cancelling the 42 on the left
        -42          -42
-----------------------
14y - 2y = 36 ...simplify
12y = 36...divide by 12 on both sides, cancelling out the 12 on the left
y = 36/12
y = 3

now , we already know that x = y + 3...and we know y = 3...so sub in 3 for y and solve for x
x = y + 3
x = 3 + 3
x = 6

solution is (6,3)

it is always a good idea to check ur answer by subbing it into one or both of the equations to see if it is correct
2x - 2y = 6......(6,3)...x = 6 and y = 3
2(6) - 2(3) = 6
12 - 6 = 6
6 = 6 (correct)

so yes, ur solution is (6,3)
4 0
2 years ago
Read 2 more answers
A car wash washes 68 cars in 8 hours. At this rate, how many cars are washed in 1 hour?
myrzilka [38]

Answer:

8.5 (If just pure cars then 8.)

Step-by-step explanation:

To find this, just divide 68/8 to find how many cars are washed in an hour. Plugging it into a calculator, we find out that it is 8.5. If you need elaboration, just comment.

6 0
3 years ago
Read 2 more answers
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