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Ksenya-84 [330]
2 years ago
7

Ms. Lynch has 21 coins in nickels and dimes.

Mathematics
1 answer:
bulgar [2K]2 years ago
4 0

Answer:

Step-by-step explanation:So we know x + y = 21 and 5x +10y = 165 We line them up in columns    x +   y =   21  5x +10y = 165 To eliminate the x variable, I'll multiply every element in the 1st equation by -5. -5x + -5y = -105  5x + 10y =  165 Now we combine (add) the equations, which eliminates x altogether.  5y = 60   ...   y = 12 From there, x + 12 = 21  ...  x = 21-12  ...  x = 9 You should double check.  Do 9 nickles and 12 dimes equal $1.65? A very important thing to remember using this method is to do the same thing to each element in the equation that you change! I hope that helps.

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At the theater, tickets for adults cost $4.75
shutvik [7]
X+y= 26 and 4.75x + 2.25y= 83.50

y=26-x( substitute this into second equation for y and solve for x)

4.75x + 2.25(26-x)= 83.50

4.75x + 58.5-2.25x= 83.50

x= 10

Now solve for y by substituting your answer for x

10+ y= 26

y=16

Therefore, 16 tickets were purchased for kids and 10 for adults.

7 0
2 years ago
Derrick's parents are finalizing a budget for his college expenses. His first year of college will cost $8,000, and his
pychu [463]
The first answer



Step by step

His first year costs $8,000
So our total amount to start with is $8,000

His second year will cost 12% more than his first so $8,000 • 1.12 = $8,960
Our total is now $16,960

His third year will again will be 12% more than his last year so $8,960 • 1.12 = 10,035.2
Our total is now $26,995.2

His last year will be 12% more than his previous year so $10,035.2 • 1.12 = $11,239.42
Our final total is $38,234.62
Which rounded equals $38,235

7 0
3 years ago
Read 2 more answers
17/21 ÷ 3 4/7 what us the estimated answer and steps to divide and find the answer
r-ruslan [8.4K]
Convert 3 4/7 into an improper fraction: 25/7
17/21 divided by 25/7

Dividing by a fraction is the same as multiplying by it's reciprocal.
17/21*7/25

Simplify:
17/3*1/25

Multiply across:
17/75
7 0
2 years ago
What makes a quadratic function unique?
Ilya [14]

Answer:

The graph of a quadratic function is a curve called a parabola which makes a quadratic function unique.

Step-by-step explanation:

Parabolas may open upward or downward and vary in "width" or "steepness", but they all have the same basic "U" shape which makes it easy to identify.

Hope it helps.

4 0
2 years ago
Read 2 more answers
3x-2+5x=-4x+5-2x solve
marysya [2.9K]

Hey there!!

Given equation :

... 3x - 2 + 5x = 4x + 5 - 2x

Combining like terms :

... 8x - 2 = 2x - 5

Subtracting 2x on both sides :

... 6x - 2 = - 5

Adding 2 on both sides :

... 6x = - 3

Dividing by 6 on both sides :

... x = -1/2 = -0.5

Hence, the answer is -0.5

Hope my answer helps!

8 0
2 years ago
Read 2 more answers
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