I need help, The question is 7x + 2x -4y thanks if you helped.

Find the cosine function that is represented in the graph.

Afair die is cast four times. calculate the probability of obtaining exactly two 6's round to the nearest tenth of a percent

Grading scale 1 has the following weights- (tests- 50% quiz- 25% homework- 15% final exam- 10%). calculate your final average if your performance in the class is as follows-test grades- {88, 84, 90, 75, 70, 81); quiz grades- {88, 67, 90, 90, 45, 99, 76, 98, 100}; homework- 90; final exam- 75