Please help!! GRAPH THE FUNCTION A sinusoidal function has these key features:
Frequency: 1/(2pi)
Maximum: -3
y intercept and minimum: -7
The function is a reflection of the parent function over the x axis.

If the slope of one line equals the slope of another line then ? a) the two lines are intersecting lines b) the two lines are perpendicular lines c) the two lines are parallel lines d) the two lines always have very steep slopes

How to do this , and can some one explain

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant. given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.