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Lapatulllka [165]
3 years ago
11

A​ student's cost for last semester at her community college was ​$2000. She spent ​$280 of that on books. What percent of last​

semester's college costs was spent on​ books?
Mathematics
1 answer:
Usimov [2.4K]3 years ago
8 0

Answer:

14%

Step-by-step explanation:

A way I usually do it is with a fraction setup.

280/2000 = ?/100

multiply 280 by 100, and you get 28000. divide this by 2000, and you get 14!

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A farmer wants to fence a rectangular garden next to his house which forms the northern boundary. The fencingfor the southern bo
Ivahew [28]

Answer:

10 ft x 10 ft

Area = 100 ft^2

Step-by-step explanation:

Let 'S' be the length of the southern boundary fence and 'W' the length of the eastern and western sides of the fence.

The total area is given by:

A=S*W

The cost function is given by:

\$ 120 = \$3*2W+\$6*S\\20 = W+S\\W = 20-S

Replacing that relationship into the Area function and finding its derivate, we can find the value of 'S' for which the area is maximized when the derivate equals zero:

A=S*(20-S)\\A=20S-S^2\\\frac{dA}{dS} = \frac{d(20S-S^2)}{dS}\\0= 20-2S\\S=10

If S=10 then W =20 -10 = 10

Therefore, the largest area enclosed by the fence is:

A=S*W\\A=10*10 = 100\ ft^2

5 0
3 years ago
You and a friend take pictures at a motocross event. Your camera can take 24 pictures in 3.75 seconds. Your friend's camera can
Dimas [21]

Answer:

1.25

Step-by-step explanation:

use the equation given

8 0
3 years ago
Write three four-digit numbers that are divisible by… 4, 5, and 9
Sedbober [7]

Answer:

32, 48, and 64?

Step-by-step explanation:

5 0
3 years ago
33% of what is 5? Help!
Slav-nsk [51]
33% of 15 is 5. If 5 = 33%, that means that x/3=5. so multiply both sides by 3 to get x=15.
It is asking what number can you take 33% of and get 5? So you are not dividing 5 by 3, you are multiplying it by 3
4 0
3 years ago
A restaurant served 315 meals. one third of the people ate a two-course meal while the remainder ate a three course meal. How ma
galben [10]

Answer:

840 courses

Step-by-step explanation:

One third of the people ate a two course meal: 105 people ate two course meals.

Two thirds of the people ate a three course meal: 210 people ate three course meals.

105X2 + 210X3 = 210 + 630 = 840 courses

5 0
3 years ago
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