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bulgar [2K]
3 years ago
7

PLEASE HELP ASAP!!!

Mathematics
1 answer:
Oksana_A [137]3 years ago
3 0
We know that
[the length of a circumference is]=2*pi*r
r=[length of a circumference]/(2*pi)

Part a)
<span>a.) Estimate the diameter of the sinkhole each week

Let
</span>first week----------> previous week
second week-----> actual week (now)

for the first week
length=75.35 m
r=75.35/(2*pi)---------> r1=12 m
Diameter=2*r---------> D1=2*12---------> D1=24 m

for the second week
length=150.42 m
r=150.42/(2*pi)---------> r2=23.95 m
Diameter=2*r---------> D2=2*23.95---------> D2=47.90 m

Part b)
<span>b,) How many times greater is the diameter of sinkhole now compared to the previous week?
[</span>diameter of sinkhole now compared to the previous week]=D2/D1
= 47.9/23.95----------> 2

the answer Part b)
the diameter of sinkhole now compared to the previous week is 2 times greater
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3 years ago
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3 years ago
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The library at a certain university reported that journal prices had increased by 120% over a period of 10 years. The report con
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Answer:

8% increase

Step-by-step explanation:

In this question, we are asked to calculate the percentage increase that a certain increment will give over a period of 10 years.

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6 0
4 years ago
Donna takes classes at both Westside community college and pinewood community college. at westside , class fees are $98 per cred
Alex777 [14]

Answer:

Expression for the combined total dollar amount she paid for her class fees is  (2185 - 17 w)

Step-by-step explanation:

Let Donna  is taking w credit hours at Westside.

Total combined credit hours at two schools =  19 hours

So, the number of credit hours at Pinewood  =  19 - w

The per hour fees credit of Westside community college = $98

So, the total fees paid for w hours  = w x Fees per hour

= w ( $98)  = $(98w)

⇒The fees Donna pays at Westside community college =  $ (98 w)

The per hour fees credit of Pinewood community college = $115

So, the total fees paid for (19 -w) hours  = (19 -w) x Fees per hour

= (19 -w) ( $115)  = $(2185 - 115 w)

⇒The fees Donna pays at Pinewood community college =$(2185 - 115 w)

Hence, the total fees paid by Donna

= Fees at Westside + Fees at Pinewood

= $ (98 w)  + $(2185 - 115 w)

= $(2185 - 17 w)

Hence, expression for the combined total dollar amount she paid for her class fees is $(2185 - 17 w)

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