1) B
2) C
can you help me? since I helped you?
-16t^2+400=0
16t^2=400
take square root on both sides.

4t=20
t=20/4
t=5
Answer:
1,164 in²
Step-by-step explanation:
the area of 1 sofa cushion =
2× ( 10×11 + 10×4 + 11×4)
= 2 × (110+40+44)
= 2×(194)
= 388 in²
the fabrics she needs to cover 3 sofa cushions =
3 × 388 = 1,164 in²
Circumference=2 x pi x radius
radius= diameter/2= 28/2= 14 ft.
c=2 x 3.14 x 14
c= 87.92 ft. or rounded to 88 feet