<span>Anna learns in her science class that the human eye blinks an average of 4,200,000 times a year. What is this number expressed in scientific notation?</span>
Answer:
in
Step-by-step explanation:
The formula to find the area of a circle:
, where
is the radius.
The formula to find the circumference (perimeter) of a circle:
, where
is the radius.
1) To find the circumference of the circle, we need to find the radius (
) first. Since the area of the circle is given to us, we need to equate this to the formula to find the area of a circle.
Cancel the
by bringing it to the other side.
÷ 

2) Find the circumference of the circle by using the formula,
.
= 
=
in
9514 1404 393
Answer:
32 feet
Step-by-step explanation:
The width of the doll house is 8/10 of the length of the doll house, so the actual house will have a width that is 8/10 of its length:
(8/10)(40 ft) = 32 ft
The actual house is 32 feet wide.