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yanalaym [24]
3 years ago
12

A bicyclist is riding at a speed of 20mi/h when she starts down a long hill. The distance she travels in feet can be modeled by

the function d(t)+= 5t^2 +20t, where t is the time in seconds.
a) The hill is 585ft long. How long will it take her to reach the bottom?
b) What if the hill were only half as long? How long would her ride take then?
Mathematics
1 answer:
QveST [7]3 years ago
5 0
A).
585= 5t²+20t
Subtract 585 to allow the equation to be equal to 0
5t²+20t-585=0
Solve the equation for x by factoring
5(t²+4t-117)=0
(t+13)(t-9)=0
t=9
9 seconds to reach the bottom

b). repeat the same process with your equation = 292.5
(292.5=5t²+20t) 

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Aleks04 [339]

Answer:

m = 60

Step-by-step explanation:

The context is very important, the 'm' represents the minutes late the parents are and from this we can eliminate some options :

- The last one because then a parent would drop their child off earlier

- The first one and the third one because it is too long

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2 years ago
Help me for brainliest...
spin [16.1K]

Answer:

1cm = 320 km?

Step-by-step explanation:

4 0
3 years ago
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WILL GIVE BRAINLIEST What is the perimeter of the track, in meters? Use π = 3.14 and round to the nearest hundredth of a meter.
Ivenika [448]

Answer:

Perimeter = 317 m

Step-by-step explanation:

Given track is a composite figure having two semicircles and one rectangle.

Perimeter of the given track = Circumference of two semicircles + 2(length of the rectangle)

Circumference of one semicircle = πr  [where 'r' = radius of the semicircle]

                                                       = 25π

                                                       = 25 × 3.14

                                                       = 78.5 m

Length of the rectangle = 80 m

Perimeter of the track = 2(78.5) + 2(80)

                                     = 157 + 160

                                     = 317 m

Therefore, perimeter of the track = 317 m

7 0
3 years ago
Mia currently has 10 email subscribers to her blog and gains an average of 10 new subscribers per day. Julie currently has 100 e
user100 [1]

Answer:

Equations:

<u>Mia: 10 + 10x = y</u>

<u>Julie: 100 - 5x = y</u>

Solved: <u>(6, 70)</u>

Step-by-step explanation:

Mia: 10 + 10x = y

She already has 10 (<u>10</u>) and gains 10 (<u>+10</u>) per day (<u>x</u>). Total is y gained.

Julie: 100 - 5x = y

She already has 100 (<u>100</u>) and loses 5 (<u>-5</u>) per day (<u>x</u>). Total is y gained.

Then I simply solve

10 + 10x = y

100 - 5x = y

Resulting in (6, 70)

6 0
2 years ago
Describe two ways 5000 and 500 are related
dalvyx [7]

Answer:

they both can be multiplied by 10 and both have more than one 0

Step-by-step explanation:

50*10=500

500*10=5000

sorry this is my first time answering a question so idk fully if its right -_-

5 0
3 years ago
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