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Alik [6]
3 years ago
13

Help!! include working out please :)

Mathematics
1 answer:
Elena-2011 [213]3 years ago
3 0
If the perimeter of a circle is d*pi, then you would do ((30*3.14)-(20*3.14))/2 to find the perimeter. 30*3.14=94.2 20*3.14=62.8 94.2-62.8=31.4 31.4/2=15.7 cm
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PLSSS HELP I don’t get how to answer this question I’m having trouble with this question
jek_recluse [69]

Answer:

525 I think correct me if im wrong

Step-by-step explanation:

3 0
3 years ago
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at a summer camp there are 50 girls out of 80. what is this ratio wrottwn as a fraction in simplest form
omeli [17]
50/80, then divide it by ten so the answer is 5/8. Once the number can divide both numbers your good.
4 0
3 years ago
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12. Which of these is not a characteristic (property) of a polygon?
DerKrebs [107]

B. Parallel faces

Not all sides need to be parallel and a polygon has only 1 face unless cut

4 0
3 years ago
Santosh spent $200, before tax, on a DVD player and DVDs. The player cost $120, new DVDs cost $15 and used DVDs cost $5. Santosh
gizmo_the_mogwai [7]

Answer:

Santosh purchased 4 new and 4 used DVDs.

Step-by-step explanation:

From the information given, as you know that Santosh spent $200 and that the DVD player cost $120, you can say that the new and used DVDs cost $80, which can be expressed as:

15x+5y=80, where:

x refers to the number of new DVDs

y refers to the number of used DVDs

Now, as the statement indicates that Santosh purchased the same number of new and used DVDs, this means that x is equal to y and you can replace y with x and solve for x:

15x+5x=80

20x=80

x=80/20

x=4

According to this, the answer is that Santosh purchased 4 new and 4 used DVDs.

3 0
3 years ago
Your fuel expense for last year was $800 this year it was $960 what was the percentage of increase. A.23% B.18% C. 15% D.20%
zhannawk [14.2K]

Answer:

The percentage of increase in fuel expenses is 20%

Step-by-step explanation:

Given:

Fuel expense in last year =  $800

Fuel expense in this year =  $960

To Find:

The percentage of increase

Solution:

Let the percentage increase be X

Then X  =\frac{\text{final value}-\text{starting value}}{\text{starting value}}\times 100

Now substituting the values we get,

X =\frac{960-800}{800}\times 100

X =\frac{160{800}\times 100

X =0.2 \times 100

X= 20%

3 0
3 years ago
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