BECE questions 2008 and 2018

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

Find the value of x in each case. give reasons to justify your solutions! d q ∈ pr