Please help i really don’t understand math

The period would be 5.

Step-by-step explanation:

The period is determined by the formula P = 2π/B.

Referring to the standard equation for sine and cosine equations, you can recall that y = A sin (B (x - C)) + D or y = A cos (B (x - C)) + D. By referring to the given equation by the problem, we can align it with the standard formula and receive B: y = -3 cos (2π/5x). 2π/5 is B. Therefore, now you divide 2π by 2π/5.

Multiply by the reciprocal: 2π/1 × 5/2π to get 5. Therefore, the period is 5.

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70