Mina asked four friends to explain how each one solved the expression 176.3 15.75  . Here are their explanations: Ivy’s explanation: I lined up the numbers to subtract. 176.3 15.75 18.8  Hannah’s explanation: I lined up the two decimals according to place value. I put a 0 in the hundredths place to make it easier for me to subtract. 176.30 15.75 161.45  Jose’s explanation: I lined up the two decimals according to place value. 176.3 15.75 161.45  An’s explanation: I counted up from 15.75 to 176.3 to find the difference. I underlined each number I added on each line. 15.75 0.25 16 16 4 20 20 150 170 170 6 176 176 0.3 176.3           I rearranged the underlined numbers to make them easier to add: 150 6 4 3 0.25 163.25      . (d) Explain each student’s mistake. (e) Solve the problem correctly. Show your work.

2 & 7

step-by-step explanation:

he climbs 300 ft/hr at a constant rate. the peak is at 1,500 ft.

when going up, he reaches 600 ft in 2 hours. remember, that he is going in a constant rate. divide 600 with 300:

600/300 = 2

assuming that he takes the same route back (meaning that it's a 1500 ft route back, you can solve.

note also that you are solving when he gets back to 600 ft after he reaches the peak.

first, find the amount of hours it takes to get up the peak. divide the total amount (1500), with the ft/her (300) to get the amount of hours (x):

1500/300 = x

x = 5

it takes jamie 5 hours to get up. now, he is returning down, and reaches 600 (his current destination). remember that he climbs at a constant 300 ft/hr. divide 600 with 300:

600/300 = x

x = 2

now add the two numbers together.

x = 5 + 2 = 7

jamie takes 7 hours to go up the mountain and reach his current position when descending.

(total amount/constant rate) = (time).

remember that it is a constant rate, so in total, when he gets back down the mountain, it will take the same amount of time as when he goes up. the total amount for the round trip is: 5 + 5 = 10.

~

x=0

step-by-step explanation:

answer: #1 ads up by 8 and i don't know #2