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Advocard [28]
3 years ago
12

If a car has tires with a radius of 1.5 ft and the tires are spinning at 840 rpm (revolutions per

Mathematics
1 answer:
tamaranim1 [39]3 years ago
5 0

Answer:

89·98 mph

Step-by-step explanation:

First, we get the circumference of the tires:

Circumference = \pi × (radius × 2)

Circumference = 3.142 × (1·5 × 2)

Circumference = 3·142 × 3

Circumference = 9·426 ft

The circumference of the tire is equal to one round.

      1 round = 9·426 ft

840 rounds = ?

We cross multiply to get the length that the tires would cover in a minute

= <u>840 × 9·426</u>

       1

    1 minute = 7917·84 ft

60 minutes = ?

<u>60 × 7917·84</u>

          1

= 475070·4 ft

      5280 feet = 1 mile

475070·4 feet = ?

<u>475070·4 × 1</u>

     5280

475070·4 ÷ 5280 = speed of the car in mph

89·97545

Round this off to 2 decimal places...

= 89·98 mph

hope this helps! =)

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There are 171 students in seventh grade. How much does money does Mr. Williams need to budget for the museum tickets and parking
Bumek [7]
<span> Here are the steps, you fill in the missing parts.
A. The given ratio is:
2 adults per 9 students or the fraction 2/9
Now put that fraction 2/9=x/171 in other words, how many adults (x) for 171 students?
can you cross multiply and get 9x=342
and solve for x?

How you have the number of students and the number of adults.

B. for food multiply $6 times the total number of people.

C. for tickets multiply 4.50 times the student number and
7.50 times the adult number.

D. for the bus parking fee multiply .04 times you total answer in part C.

Now add up the food, tickets, bus parking and I think you have what Mr. Williams has to budget. </span>
8 0
3 years ago
the oval track below is formed by a straight section on each side and a semicircle at each end. what is the approximate distance
nikklg [1K]

Answer:

1040

Step-by-step explanation:

Circumference of the Circle: 439.82

Add that to the length of the rectangle time two: 439.82+(300x2)

That will give you the perimeter around the entire track:

439.82+(300x2)

439.82+600

1039.82

Rounded that is: 1040

<em>Hope this Helps :)</em>

4 0
3 years ago
Read 2 more answers
In Jefferson Middle School, 5% of the sixth graders have red hair. If there are 100 sixth graders, how many have red hair?
k0ka [10]

Answer:

5

Step-by-step explanation:

Take the number of 6th graders and multiply by the percent that have red hair

100 * 5%

100 * .05

5

3 0
3 years ago
Read 2 more answers
During the construction of a skyscraper, a bolt fell from 400 ft. What was the speed of the bolt when it hit the ground?
lions [1.4K]

Answer:

160

Step-by-step explanation:

v^2 = 64d

d = 400

v^2 = 64*400

v = sqrt of (64*400) = 160

4 0
3 years ago
Spartan Stadium at San Jose State University in California has a seating capacity of about 30,000. A newspaper article states th
Jet001 [13]

Answer:

Number of tickets for the Spartans = 24000

Number of tickets for the visiting team’s fans = 6000

Step-by-step explanation:

Let the no. of tickets for the visiting team’s fans be x.

so,according to the question

no. of tickets for the Spartans = 4x

total seating capacity of Spartan Stadium = 30000

now, we see that,

4x+x = 30000

5x = 30000

x = 30000/5

x = 6000

Number of tickets for the visiting team’s fans = x = 600

Number of tickets for the Spartans = 4x = 4(6000) = 24000

4 0
3 years ago
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