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Hz is the measurement of a frequency equal to one cycle per second. since this wave shows 9 peaks and valleys or "cycles" your answer would be 3 Hz due to the fact that the length of time is 3 seconds. (3 cycles per second X 3 seconds.)
151 L
V1/T1 = V2/T2
V1 = 95 L
T1 = 110 K
T2 = 175 K
Solve the equation for V2 —> V2 = V1T2/T1
V2 = (95 L)(175 K) / (110 K) = 151 L