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emmainna [20.7K]
3 years ago
8

Jenn's phone has a fully charged battery. With normal usage, he phone will last 16 hours. How long will her battery last if it o

nly charged 30%?
Can you show the work please, thank you!
Mathematics
1 answer:
Citrus2011 [14]3 years ago
6 0

The correct answer is 4.8 hours

Explanation:

This mathematical problem can be solved by using the rule of three, which involves finding an unknown value by using three related values. The process is shown below:

1. It is known a fully charged battery (100% battery) lasts 16 hours. This can be represented as 100 = 16. But it is not know how much a 30% battery last; this can be represented as 30 = x.

2. Write all the values

100 = 16

30 = x

3. Cross multiply to create an equation and solve the equation

100 x = 48

x = 480 / 100

x = 4.8

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lesantik [10]
#6 is incorrect
it's 6 7/8
#7 is correct
6 0
3 years ago
Write the quadratic equation whose roots are 3 and -1, and whose leading coefficient is 5.
Assoli18 [71]

Answer:

5x² - 10x - 15 = 0

Step-by-step explanation:

Given that the roots are x = 3 and x = - 1, then the factors are

(x - 3) and (x + 1) and the quadratic is the product of the factors, that is

f(x) = a(x - 3)(x + 1) ← a is a multiplier

Here a = 5, thus

f(x) = 5(x - 3)(x + 1) ← expand factors using FOIL

     = 5(x² - 2x - 3) ← distribute parenthesis by 5

     = 5x² - 10x - 15

Thus equation is

5x² - 10x - 15 = 0

6 0
3 years ago
How do I solve this? Whats the answer?
Annette [7]
4 because it is the only number on the x side of the table that you can get a single value for y from
4 0
3 years ago
If the original quantity is 8 and the new quantity is ​,2 what is the percent​ decrease?
azamat

Answer: 75%

Step-by-step explanation:

75% of 8 is 6.

8 was decreased by 6 to get 2.

8 was decreased by 75% of its initial value to get 2.

Hope this helped!

3 0
3 years ago
Read 2 more answers
I need help with this math question
djyliett [7]
Percent means per one hundred so we can say that:

p/100≈(28)/(28+81+45+63+35)  guessing with my old eyes :)

p/100≈28/252

p≈2800/252

p≈11.11%

So rounded to the nearest 5% you'd have:

p≈10%
5 0
4 years ago
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