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katovenus [111]
3 years ago
6

13+(4 to the 3rd power ÷2 )×5-7

Mathematics
2 answers:
frozen [14]3 years ago
7 0

Answer:

166

Step-by-step explanation:

PEMDAS

1 () 2 Exponents 3 Multiplication 4 Divide 5 Addition 5 Subtraction

4 to the power of 3 is 64

64 ÷ 2 is 32

32 × 5 is 160

160 + 13 is 173

173 - 7 is 166

Vinvika [58]3 years ago
3 0

Answer:185

Step-by-step explanation:

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The percentage of the radioactive isotope left is 25.0000%.

<h3>What is the half life?</h3>

The half life of a radioactive isotope is the time that will elapse before only half of the number of original isotopes will remain.

Now;

We are told that;

Half life (t1/2) = 55 days

Time taken (t) =  115 days

Ratio of isotope remaining = N/No

Thus;

N/No = (1/2)^t/t1/2

N/No = (1/2)^115/55

N/No = (1/2)^2

N/No =1/4

Hence, the percentage = 1/4 * 100/1 = 25.0000%

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2 years ago
When I count as a principal of $1000 and earns 4% simple interest per year and other account as a principal $1000 and earns 4% i
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Answer: the account that earned compound interest has the greater balance at the end of four years.

Step-by-step explanation:

The formula for determining simple interest is expressed as

I = PRT/100

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I represents interest paid on the amount invested.

P represents the principal or amount invested.

R represents interest rate

T represents the duration of the investment in years.

From the information given,

P = 1000

R = 4%

T = 4 years

I = (1000 × 4 × 4)/100 = 160

Total amount earned is

1000 + 160 = $1160

The formula for determining compound interest is expressed as

A = P(1+r/n)^nt

Where

A = total amount in the account at the end of t years

r represents the interest rate.

n represents the periodic interval at which it was compounded.

P represents the principal or initial amount deposited

From the information given,

P = 1000

r = 4% = 4/100 = 0.04

n = 1 because it was compounded once in a year.

t = 4 years

Therefore,.

A = 1000(1+0.04/1)^1 × 4

A = 1000(1.04)^4

A = $1170

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3 years ago
Find a pair of integers with a product of -84 and a sum of 5.
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Answer:

12 x -7 = -84 12 + (-7) = 5

Step-by-step explanation:

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21515754 people total* 0.38= 8175986.52 people

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