Determine whether the biconditional statement is true or false. If false, give a counterexample. The number k is a positive integer if and only if 5k is a natural number.

A. true
B. false; 5k = 1, then k = −1/5, which is not a positive integer
C. false; 5k = 25, then k = 5 which is not a positive integer
D. false; 5k = 1, then k = 1/5, which is not a positive integer

fa tha first one you gonna add y to both sides

it look like this

x-y+y=6+y

x=y+6

therefore your answer is

x =y+6

fa tha second one

you gonna flip tha equation

it gonna look like x-4y=y

then add 4 to both sides

it gonna look like tha

x-4 +4 =y +4

so therefore tha answer is x=y+4

step-by-step explanation:

d. it is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.

step-by-step explanation:

answer: you need to organize this better it does not make sense.

step-by-step explanation: ?

it would rotate about 180 degrees.