1. Marla coloured 1/4 of a picture, and Suman painted some, too. When they were finished, 2/3 of the picture still needed to be
1 answer:
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Answer:
Step-by-step explanation:
-We can use the exponential decay function to estimate the size after 13 years:
Where:
is the size after t years, t is the time, r is the rate of decay and
the original size.
#We substitute and calculate as:
Hence, the forest covers after 13 years.
Answer:
128.86 cm^2
Step-by-step explanation:
So to start off we need to find the area of the rectangle.
The formula for the area of a rectangle is ×
.
L stands for the length which is 12 and w is the width which is 11.
So 11 × 12 = 132 cm^2.
Now time for the area of a circle.
The formula for that is .
So first we need to do 1 × 1 which is 1.
Then 1 × which is just
.
Then we do 132 - which is an irrational number.
It looks like this shortened 128.858407346.
Now rounding to the nearest hundreth it would be 128.86 cm^2.
Hence, the area of the shaded region is 128.86 cm^2.