Please help me thank you

HJ=AB ( Sides of Congruent triangle)

=3.5cm

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like:

its kinda hard to answer this when we dont have all the information that we need.