Awooden plank is leaning against a wall.
the bottom of the plank is 4 feet from the wall.
a) using the sine ratio, find ac, the approximate length of the plank.
round to the nearest tenth of a foot. (10 points)
b) using the tangent ratio, find bc, the height off the ground where the plank touches the wall.
round to the nearest tenth of a foot. (10 points)

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap

If the value of cos330°is√3/2 then find cos 165°.

Data for the height of a model rocket launch in the air over time are shown in the table. darryl predicted that the height of the rocket at 8 seconds would be about 93 meters. did darryl make a good prediction? yes, the data are best modeled by a quadratic function. the value of the function at 8 seconds is about 93 meters. yes, the data are best modeled by a linear function. the first differences are constant, so about 93 meters at 8 seconds is reasonable. no, the data are exponential. a better prediction is 150 meters. no, the data are best modeled by a cubic function. a better prediction is 100 meters.