1) explain to someone how you would do the problem -12 + 5. explain to them how they would know if the final answer was going to be positive or negative. explain to them how they’d calculate the final answer. model for them using the number line model and/or the two colored counter method.

2) a football team gained 7 yards, lost 3 yards, gained 15 yards, lost 2 yards, lost 3 yards
and gained 6 yards. what is the net gain or loss? explain how you found your answer.
answer the question in a complete sentence.

1) -12 + 5 = -7 you just set it up and solve it like a regular problem and then to see if its a - or + we see what number was bigger so -12 is bigger then +5 so our answer is -7

2) 7 -3 + 15 - 2 - 3 + 6 so lets add up all the negative numbers and all the positive numbers so now we have + 28 - 8 so the we solve +28 - 8 = +20 again the sign goes with the bigger number!

Hope this helps ;)

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)

da freeck kinda math is this just drop out

step-by-step explanation: