For each expression, select all equivalent expressions from the list. (a) 4(5x-2)

1) 20x-2
2) 20x - 8
3) 9x-2
4) 4.5x-4.2

(b) 8y + 5y + 7y

1) 8y+12y
2) 12y-8y
3) 20y
4) 20+ y

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)

answer for #1 is c

answer for #2 is d

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answer: what are the following choices