2 years ago

I need help! Does anyone understand?

Mathematics

1 answer:

nirvana33 [79]2 years ago

6 0

Answer:

the answer should be G or H

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The relationship between x and y is proportional. When x is 3, y is 51. What is x when y is 204? Enter your answer in the box.

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Step-by-step explanation:

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3 years ago

What is the number 5 2/7 written as a improper fraction

WARRIOR [948]

Answer:

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3 years ago

1.Arsenic-74 is used to locate brain tumors. It has a half-life of 17.5 days. 90 mg wereused in a procedure. Write an equation t

Sophie [7]

$1)\text{ }N_t\text{ = 90\lparen}\frac{1}{2})^{\frac{t}{17.5}}$

2) 5.625 mg will be left

Explanation:

1) Half-life = 17.5 days

initial amount of Arsenic-74 = 90 mg

To get the equation, we will use the equation of half-life:

$\begin{gathered} N_t\text{ = N}_0(\frac{1}{2})^{\frac{t}{t_{\frac{1}{2}}}} \\ where\text{ N}_t\text{ = amount remaining} \\ N_0\text{ = initial amount} \\ t_{\frac{1}{2}\text{ }}\text{ = half-life} \end{gathered}$ $N_t\text{ = 90\lparen}\frac{1}{2})^{\frac{t}{17.5}}$

2) we need to find the remaining amount of Arsenic-74 after 70 days

t = 70

$\begin{gathered} N_t=\text{ 90\lparen}\frac{1}{2})^{\frac{70}{17.5}} \\ N_t\text{ = 5.625 mg} \end{gathered}$

So after 70 days, 5.625 mg will be left

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1 year ago

(y* - 5)(yx + 5)<br> please help

Nina [5.8K]

Answer:

Simplified the expression.

y2x+5y−5yx−25

I think this is what were were asking, if not please explain better.

Hope this helps :D

plz like & brainly

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3 years ago