elenagarcia123
27.08.2019 •
Mathematics
1. if a triangle has a height of 14 inches and a base of 9 inches, what is its area? a. 46 square inches
b. 126 square inches
c. 135 square inches
d. 63 square inches
2. the area of a square piece of cardboard is 81 square inches. what is the length of the cardboard? a. 9 inches
b. 10 inches
c. 8 inches
d. 20.25 inches
3. a round barbecue pit is 2 meters in diameter. what is the distance around the barbecue pit? a. 3.14 meters
b. 6.28 meters
c. 12. 56 meters
d. 18.84 meters
4.what is the area of a square television screen with 16-inch sides? a. 32 square inches
b. 256 square inches
c. 160 square inches
d. 64 square inches
5. sheri's freezer is 2 feet wide, 6 feet long, and 2 feet deep. what is the volume of her freezer? a. 24 cubic feet
b. 12 cubic feet
c. 10 cubic feet
d. 4 cubic feet
6. find the volume of a cylinder with a diameter of 10 inches and a height of 20 inches. use 3.14 for π. a. 6,280 cu. in.
b. 1,570 cu. in.
c. 705 cu. in.
d. 62.8 cu. in
7. what is the area of an equilateral triangle with sides of 10 inches and height of 7 inches? a. 20 sq. in.
b. 70 sq. in.
c. 35 sq. in.
d. 44 sq. in
8. the distance from the center of a compact disc to the edge of the disc is 6 centimeters. what is the area of the compact disc?
a. 452.16 square centimeters b. 113.04 square centimeters c. 36 square centimeters
d. 18.84 square centimeters
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Ответ:
Ответ:
11 seconds
Step-by-step explanation:
If the height h(t) of the sunglasses after t seconds is given by the polynomial function
h(t)=-16t²+1936
The sunglasses will hit the ground when the height h(t)=0
h(t)=-16t²+1936=0
-16t²+1936=0
-16t²=-1936
t²=1936/16=121
t=√121=11 seconds
The Sunglasses will hit the ground 11 seconds after it is dropped by the pilot.