HELP!!
If we changed -4 to a 4 in the equation, what would happen to the graph?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Which one ? is the answer and how to find this answer

Evaluate cos2θ for cosθ = square root of 3/2