A rollercoaster track consists of a series of vertical curves.
Near the top of one of these curves, the track enters a tunnel, where passengers ride in
the dark for a short duration. The parabola in the graph represents the rollercoaster
track,
The vertex of this parabola is at (7.5. 21), and another point on the track is at (0.9).
A steel beam is part of the supporting structure of the rollercoaster track. The beam is
attached to the framework at the points (0.12) and (12, 19). determine the two equations of the parabola (quadratic function) and line​

The answer is in the image 

The total nom of  code that can be used is equal to 5+3 = 8

The answer is in the image 

For every 8 cars there are 7 trucks

Therefore,

Cars:Truck=8:7

Answer is B)8:7

y=2x+15

where y=Value of coin

x=Age in years

Value of coin after 19 years=2*19+15

=$53

Therefore, Value after 19 years=$53

F=ma

where F=force

m=mass

a=acceleration

Here,

F=4300

a=3.3m/s2

m=F/a

    =4300/3.3

    =1303.03kg

The answer is in the image 

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.

The wood before starting =12 feet

Left wood=6 feet

Wood used till now=12-6=6 feet

Picture frame built till now= 6/(3/4)

=8 pieces

Therefore, till now 8 pieces have been made.

tip=18% of 75.45

     =18/100 * 75.45 = $13.581

Tip = $13.581