At the corner store, nico bought 5 pencils for $0.10 each and 3 pens for $0.50 each. he used t to represent the sales tax, in dollars, that he also paid. he paid a total of $2.12, including tax. nico wrote this equation to represent what he paid. what errors, if any, did he make? 5(0.10) + 3(0.50) - t = 2.12 he should have multiplied 0.10 by 3 instead of 5. he should have multiplied 0.50 by 5 instead of 3. he should have added t instead of subtracting t. he should have multiplied by t instead of subtracting t.

C. He should have added t instead of subtracting t.

Step-by-step explanation:

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)

well there are two answers for that.

1: you need 120 ones then that will equal up to 120.

2: you could also do one 100 and 2 tens.

those are the answers that i have thought of.