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Marizza181 [45]
4 years ago
6

Last yearrhere were 1436 8th grade students enrolled at your school. This year there are 1220. What is the percent change in the

number of 8th grade students?
Mathematics
1 answer:
Tanzania [10]4 years ago
8 0

\frac{1220 \times 100}{1436}  \approx 85\% \\ 100\% - 85\% = 15\% \: change

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Max has 5.50. He has eight more quarters than he does nickels. He had four times as many dimes as he has nickels. How many quart
Oliga [24]

Answer:

<h2>There are 13 quarters, 5 nickels and 20 dimes.</h2>

Step-by-step explanation:

Givens

  • Max has $5.50.
  • He has eight more quarters than he does nickels.
  • He had four times as many dimes as he has nickels.

From these statements, we can deduce algebraical expressions to solve the problem. Let's call q quarters, n nickels and d dimes.

q=n+8 (8 more quarters than nickels)

d=4n (he has four times as many dimes as he has nickels).

0.25q+0.05n+0.10d=5.50 (Max has a total of $5.50, one quartes is $0.25, one nickel is $0.05 and one dime is $0.10).

Let's replace the first two expressions into the third equation

0.25(n+8)+0.05n+0.10(4n)=5.50\\0.25n+2+0.05n+0.40n=5.50\\0.70n=5.50-2\\n=\frac{3.50}{0.70}\\ n=5

There are 5 nickels.

Now, we use this value to find the number of quarters

q=5+8=13

There are 13 quarters.

Also, d=4(5)=20

There are 20 dimes.

Therefore, there are 13 quarters, 5 nickels and 20 dimes.

3 0
3 years ago
Patton's troops covered 48 miles in 4 hours. he then increased the speed by 8 miles an hour. if the total distance was 108 miles
masya89 [10]
                               48 miles/4hrs = 12 mph

Increased Speed 12 mph + 8mph = 20 mph

Distance left        108 miles - 48 miles = 60 miles

Time left               60 miles/20 mph = 3 hours

7 0
3 years ago
Plz solve it
konstantin123 [22]

Answer:

Fgh= -5x^3-^2+45x+9

Gfh= (3-x)(5x+1)(x+3)

I don't think you can do anything with the second one.

Step-by-step explanation:

8 0
3 years ago
How do you use unit rates to help you solve a word problem
OleMash [197]
Answer:

You could find the unit rate by dividing the first term of the ratio by the second term.
4 0
3 years ago
What is the volume of this rectangular prism?
tangare [24]
180
This is because 12x5x3 = 180
5 0
2 years ago
Read 2 more answers
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