70. area a car's rear windshield wiper rotates 125º. the
total length of the wiper mechanism is 25 inches and
the length of the wiper blade is 14 inches. find the area
wiped by the wiper blade.

The area that is wiped by the blade is required.

The area wiped by the blade is

= Angle of sweep =

= Distance from the start of the mechanism to the tip of the blade = 25 inches

= Distance from the start of the mechanism to the beginning of the tip =

Area of sector of circle is

Area of the wiped region would be

The area wiped by the blade is

Learn more:

link

link

175 square inches

Step-by-step explanation:

Area wiped by the wiper blade = Area covered by the whole wiper mechanism - Area that is not being wiped.

Where area of a sector of 125°Area = 1/2.r^2.thetabut with theta in radians

Area covered of the whole wiper mechanism;

= 1/2 × 25^2 × (25pi/36)...in which (25pi/36) is 125° in radians..

=217.014pi

Area that is not being wiped;

= 1/2 × (25 - 14)^2 × (25pi/36)

= 42.014pi

Area wiped by the wiper blade

217.014 - 42.014

Area = 175 square inches

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation:

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9