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ycow [4]
3 years ago
10

A cell phone battery charges at a rate of 16% every thirty minutes. When initially plugged into the charger, a cell phone has 10

% battery.
1.Write an equation relating the amount of time, measured in hours, it takes to charge a cell phone as a function of the battery charge.
2.Use complete sentences to describe the rate in which the battery charges in terms of the time that it is charging.
Mathematics
2 answers:
grandymaker [24]3 years ago
8 0

30 minutes is 1/2 an hour so 16 x 2 = 32 the phone charges at 32% per hour.

1. Multiply the number of hours by the rate and add the original 10% to that for total charge:

Y = 0.32h + 0.10

2. The phone charges at 16% every thirty minutes which is a half hour so you double the rate it charges to get the rate per hour. The phone charges at 32% per hour that it is charging.

Aleks [24]3 years ago
8 0

30 minutes is 1/2 an hour so 16 x 2 = 32 the phone charges at 32% per hour.

1. Multiply the number of hours by the rate and add the original 10% to that for total charge:

Y = 0.32h + 0.10

2. The phone charges at 16% every thirty minutes which is a half hour so you double the rate it charges to get the rate per hour. The phone charges at 32% per hour that it is charging.

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A diving board is 10 feet above the surface of the water. At time t = 0, the board propels Chris upward at a rate of 12 feet per
Art [367]

Answer:

Chris will take 0.75 seconds to return to his starting height of 10 feet.

Step-by-step explanation:

Let the height of Chris be represented by h(t) = -16\cdot t^{2}+12\cdot t +10, where h(t) is the height in feet and t, the time in seconds. First, we equalize the formula to a height of 10 feet and simplify the resulting expression, that is:

-16\cdot t^{2}+12\cdot t +10 = 10

-16\cdot t^{2}+12\cdot t = 0

Then, we simplify the expression by algebraic means:

-16\cdot t\cdot \left(t-\frac{3}{4} \right) = 0

Roots of the polynomial are, respectively:

t = 0\,s\,\lor \,t = 0.75\,s

First root represents the initial height of Chris, whereas the second one represents the instant when Christ returns to the same height above the surface of the water. Hence, Chris will take 0.75 seconds to return to his starting height of 10 feet.

5 0
3 years ago
A principal of $2800 is invested at 8% interest, compounded annually. How much will the investment be worth after 9 years?
Helga [31]

Answer:

2,016

Step-by-step explanation:

You do 2800 x 0.08 in ur calculator which is 224 and multiply that by 9

3 0
3 years ago
Is 3(5x - 4) = 15x - 12 a one solution , no solution or infinite solutions
vaieri [72.5K]

Answer:

Infinite Solutions

Step-by-step explanation:

3(5x - 4) needs to be simplified

So we multiply 5x by 3

So 3 x 5x = 15x

Then we multiply -4 by 3

3 x -4 = - 12

Put those together we get 15x - 12

The same equation as the one on the right side

So since 15x - 12 = 15x - 12, the x variable can be any number

Also a little tip:

With Forms quizzes, you can hit control + U and find the answers in the code

6 0
3 years ago
A triangle has an area of 117.9 square millimeters and a base of 18 millimeters. What is the height?
morpeh [17]

Answer:

13.1

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
All the information in the photo.
a_sh-v [17]

Answer:

Two angles are called complementary when their measures add to 90 degrees. ∠1 is 60 degrees ∠2 is 30 degrees so if you add it up, the answer is  90 degrees.

∠4 + ∠3 = answer has to be 90 degrees to call it a complementary angle

30 degrees + 60 degrees = 90 degrees

6 0
3 years ago
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