Jana and her friend bought 4 hamburgers, 3 orders of fries, and 2 milk shakes for $3 each. they paid for the food with $20. which part of the equation represents the total cost of their items? justify your answer.
c = $20 - (4h + 3f + 6)
a) $20; they paid $20 for the food.
b) (4h + 3f); find the total cost by adding the price of 4 hamburgers to the price of 3 fries
c) 4h + 3f + 6; find the total cost by adding the price of 4 hamburgers to the price of 3 fries to the price of 2 milkshakes.
d) c = 20 - (4h + 3f + 6); find the total cost by subtracting the price of 4 hamburgers to the price of 3 fries to the price of 2 milkshakes.

For this case we have the following variables:

h: Cost of each hamburger bought by Jana and her friend

f: Cost of each order of potato chips bought by Jana and her friend

b: Cost of each milkshake

If you bought 4 hamburgers, 3 orders of potatoes and 2 milkshakes, you have a cost of:

It is known that each shake costs $ 3, so$

Substituting we have:

Thus, the total cost is given by:

Option C

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.

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