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3 years ago

What is the answer? Some please help!!

Mathematics

1 answer:

Aleksandr [31]3 years ago

4 0

Answer:

Area of the figure = 200 cm²

Step-by-step explanation:

Area of rectangle A = Length × Width

= 5×9

= 45 cm²

Area of rectangle B = 5 × 11

= 55 cm²

Area of rectangle C = 5 × 9

= 45 cm²

Area of rectangle D = 5 × 7

= 35 cm²

Area of rectangle E = 10 × 2

= 20 cm²

Total area of the figure = 45 + 55 + 45 + 35 + 20

= 200 cm²

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Answer:

At time, 10 seconds, the mass remaining is 24 grams

At time, 20 seconds, the mass remaining is 12 grams

At time, 30 seconds, the mass remaining is 6 grams

At time, 40 seconds, the mass remaining is 3 grams

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Step-by-step explanation:

Given;

initial mass of the radioactive element = 48 grams

half life, t = 10 seconds

time of decay (s) remaining mass of the radioactive element

0 ------------------------------------------------- 48 grams

10------------------------------------------------- 24 grams

20 ------------------------------------------------- 12 grams

30 -------------------------------------------------- 6 grams

40 --------------------------------------------------- 3 grams

50 ----------------------------------------------------- 1.5 grams

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Thus;

At time, 10 seconds, the mass remaining is 24 grams

At time, 20 seconds, the mass remaining is 12 grams

At time, 30 seconds, the mass remaining is 6 grams

At time, 40 seconds, the mass remaining is 3 grams

At time, 50 seconds, the mass remaining is 1.5 grams

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