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Brilliant_brown [7]

3 years ago

5

The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass

. Starting with 190 grams of a radioactive isotope, how much will be left after 4 half-lives?

1 answer:

Semmy [17]3 years ago

5 0

190*(1/2)^4 = 190/16 = 11.875 . . . grams

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Which expression is equivalent to 486 – 9 + 6 + 33 × 2? A . [(486 – 9) + (6 + 33)] × 2 B . 486 – [(9 + 6 + 33) × 2] C . (486 – 9

hichkok12 [17]

Answer:

D . (486 – 9 + 6) + (33 × 2)

Step-by-step explanation:

Which expression is equivalent to 486 – 9 + 6 + 33 × 2?

486 – 9 + 6 + 33 × 2

486 – 9 + 6 + 66

477 + 6 + 66

549

D . (486 – 9 + 6) + (33 × 2)

477 + 6 + 66

549

Hope this helps!

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2 years ago

200x50 mathematics problem

Neporo4naja [7]

200*50=10,000.
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8 0

3 years ago

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What is the answer to 5x-10

IrinaVladis [17]

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3 years ago

A group of friends wants to go to the amusement park. They have no more than $275 to spend on parking and admission. Parking is

Evgesh-ka [11]

Answer:

275=27x+5

Step-by-step explanation:

10 people can go to the park

27(10)+5=275

4 0

2 years ago

If inflation from last year to this year was 2% and a pair of designer jeans sold for $75 last year, what would you expect to pa

tamaranim1 [39]

Answer:

$76.5

Step-by-step explanation:

We have been given that inflation from last year to this year was 2% and a pair of designer jeans sold for $75 last year. We are asked to find the price of pair of designer jeans this year.

An inflation of 2% will increase the price of pair of jeans by 2%, so price of pair of jeans this year would be $75 plus 2% of $75.

$\text{Price of pair of jeans this year}=\$75+\$75\times\frac{2}{100}$

$\text{Price of pair of jeans this year}=\$75+\$75\times0.02$

$\text{Price of pair of jeans this year}=\$75+\$1.5$

$\text{Price of pair of jeans this year}=\$76.5$

Therefore, the price of pair of jeans would be $76.5 this year.

7 0

2 years ago