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2 years ago

Which of the following is equal to 105×5 ?

Mathematics

2 answers:

katovenus [111]2 years ago

7 0

Answer: D

Step-by-step explanation:

105 x 5 = 525

A. (100+5) + (5+5) = 105 + 10 = 115 (no)

B. (100+5) × (5+5) = 105 x 10 = 1050 (no)

C. (100×5) × (5×5) = 500 * 25 = 12500 (no)

D. (100×5) + (5×5) = 500 + 25 = 525 (yes)

Marat540 [252]2 years ago

3 0

Answer:

your answer is D)!!!!!!!!!

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Suppose the half-life of a material is 10 days. You have one 1 kg of the material today. How much of the material would you have

boyakko [2]

Answer:

0.50 kg of the material would be left after 10 days.

0.25 kg of the material would be left after 20 days.

Step-by-step explanation:

We have been given that the half-life of a material is 10 days. You have one 1 kg of the material today. We are asked to find the amount of material left after 10 days and 20 days, respectively.

We will use half life formula.

$A=a\cdot(\frac{1}{2})^{\frac{t}{h}}$ , where,

A = Amount left after t units of time,

a = Initial amount,

t = Time,

h = Half-life.

$A=1\text{ kg}\cdot(\frac{1}{2})^{\frac{10}{10}}$

$A=1\text{ kg}\cdot(\frac{1}{2})^{1}$

$A=1\text{ kg}\cdot\frac{1}{2}$

$A=0.5\text{ kg}$

Therefore, amount of the material left after 10 days would be 0.5 kg.

$A=1\text{ kg}\cdot(\frac{1}{2})^{\frac{20}{10}}$

$A=1\text{ kg}\cdot(\frac{1}{2})^{2}$

$A=1\text{ kg}\cdot\frac{1^2}{2^2}$

$A=1\text{ kg}\cdot\frac{1}{4}$

$A=0.25\text{ kg}$

Therefore, amount of the material left after 20 days would be 0.25 kg.

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