Answer all of the questions and follow directions. show the answers clearly. first to complete all will get brainliest answer . .

answer:

step-by-step explanation:

(1) x + 0.40 or x + 40/100

(2)$x - 0.06 or $x - 6/100

(3) length(l) + width(w) = perimeter(p)

pretty sure you get it but

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)