(R/s)(3) = ? Please hurry

Find the amplitude of a sinusoidal function that models this temperature variation

If the tip varies directly with the number of guest which equation represents between the tip, t, and the number of guest, g?

20 points for the answer. this is for real , don't put random ! a rectangle has a length of 4 centimeters and a width of 7 centimeters. what is the effect on the perimeter when the dimensions are multiplied by 5? the perimeter is increased by a factor of 5. the perimeter is increased by a factor of 20. the perimeter is increased by a factor of 25. the perimeter is increased by a factor of 100.