What expression is equivalent to 42x-56y

For this case, the first thing we must do is find the multiples of the coefficients.

We have then:

We observe that the biggest common factor is given by 7.

Therefore, by rewriting the expression we have:

An equivalent expression is given by:

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)