A pendulum is swinging next to a wall. The distance D(t) (in cm) between the bob of the pendulum and the wall as a function of time t (in
seconds) can be modeled by a sinusoidal expression of the form a • sin(b. t) + d.
Att = 0, when the pendulum is exactly in the middle of its swing, the bob is 5 cm away from the wall. The
bob reaches the closest point to the wall, which is 3 cm from the wall, 1 second later.
Find D(t).

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.

The ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?