I am very confused on how to do this can someone please tell me how?

1. 4

2. -4

Step-by-step explanation:

You plug in the number given in the parentheses into the function(s) as x

for #1:

since its f(4)

you would do the following -> f(4) = 2(4) - 4 hence the answer of 4.

for #2:

since its g(2)

you would do the following -> g(2) = 2^2 - 4(2) hence the answer of -4

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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)