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2 years ago

Find the percent of increase from 15 to 20

Mathematics

2 answers:

ANEK [815]2 years ago

8 0

I think it might be 25%

Angelina_Jolie [31]2 years ago

6 0

Original: 15
New: 20

You would want to put new - original / original for percent of increase. In this case, it would be 20 - 15 / 15, which would get you 5 / 15. Simplify: 1 / 3. Now you can change it into decimal, which equals to 0.333333 (With repeat bar on top) and it would equal to 33.3%.

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What happens to 1.7 when you multiply it by 10'

igomit [66]

Move the decimal point to the right one place value.

1.7 x 10 = 17

17 is your answer

hope this helps

7 0

3 years ago

Suppose that 1 kg of Sodium-24 is reduced to 0.0156 kg in 90 hours. What is the half-life, in hours, of Sodium-24?

N76 [4]

Answer:

14.99 hours

Step-by-step explanation:

The formula for half-life is given as,

R/R' = 2ᵃ/ᵇ...................... Equation 1

Where R= Original mass of sodium-24, R' = mass of Sodium-24 after disintegration, a = Total time taken for sodium-24 to disintegrate, b = half-life of sodiun-24.

Given: R = 1 kg, R' = 0.0156 kg, a = 90 hours

Substitute into equation 1 and solve for b

1/(0.0156) = 2⁹⁰/ᵇ

Taking the log of both side

log[1/(0.0156)] = log(2⁹⁰/ᵇ)

log[1/(0.0156)] = 90/b(log2)

90/b = log[1/(0.0156)]/log2

90/b = 6.0023

b = 90/6.0023

b = 14.99 hours

b = 14.99 hours.

Hence the half-life of Sodium-24 is 14.99 hours

7 0

3 years ago

Which expression is equivalent to the given expression?

I am Lyosha [343]

Answer:

C. - 4x^2 + 5x - 4

Step-by-step explanation:

just expand the equation and you'll get C

6 0

3 years ago

Read 2 more answers

Which number is a factor of the prime factorization of 60? <br>3, 15, 9, or 6

Anton [14]

Answer:3

Step-by-step explanation:

4 0

2 years ago

Please help me figure this out

polet [3.4K]

Answer:3⁴ and 81¹

Step-by-step explanation:

3⁹= 19683

3⁴= 81

-9²= -81

9⁹= 387,420,489

81¹= 81

8 0

3 years ago