Answer:

Step-by-step explanation:
Given

Required
When will the coin hit the ground
When the coin hits the ground, 
The expression
becomes

Multiply through by -1

Solve using quadratic formula

Where








Split
or 
or 
or 
But time can't be negative;
So:
<em>Time to hit the ground is 1.71825 seconds</em>
Answer:
Step-by-step explanation:
Rounded to 1 sig fig, the number is 40; rounded to 2 sig fig's, the number is 41; rounded to 3, the number is 41.1
Answer:
it is slightly less than 12
Step-by-step explanation:
Answer:
A = 42 cm²
Step-by-step explanation:
the area (A) of a parallelogram is calculated as
A = bh ( b is the base and h the perpendicular height )
here b = 6 and h = 7 , then
A = 6 × 7 = 42 cm²
Answer:
1,2,4,5,6
Step-by-step explanation: