3. The figure shows the curve y = -x - x + 20.
(i) The curve cuts the x-axis at two points A and
B, and the y-axis at the point C. Find the
coordinates of A, B and C.
(ii) The point D(3, h) lies on the curve. Find the
value of h.
6. The
y=-x? - x + 20
of a

it's probably B.

Step-by-step explanation:

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours