calculation of activation energy

A graph plotted between log k versus 1//T for calculating activation energy is shown by

Activation energy is

A chemical reaction occur at the same rate at 500K as at 300K" in presence of catalyst.If catalyst decreases the activation energy by "35kJ/mole , then calculate the activation energy of uncatalysed reaction (in kJ/mole)

Activation energy is:

Given that the temperature coefficient for the saponification of ethylacetate by NaOH is 1.75 . Calculate the activation energy.

Calculate the activation energy of a reaction whose reaction rate at 310 K gets doubled for 320 K rise in temperature.