Giving 15 points for !

mr. yi buys vegetables at a market. he purchases 6 pounds of potatoes, p, and 3 pounds of onions, n, for $18. onions cost twice as much as potatoes. to determine the unit price for each item, his daughter sets up and solves the system of equations shown.

6p + 3n = 18 and 2n = p
6(2n) + 3n = 18
12n + 3n = 18
15n = 18; n = $1.20
onions cost $1.20 per pound.

analyze the daughter’s solution. which statements are true? check all that apply.

the equation 2n = p should be 2p = n.

the equation 6p + 3n = 18 should be

6n + 3p = 18.

the actual cost of the onions is $3.00 per pound.

potatoes cost $0.60 per pound.

potatoes cost $1.50 per pound.

potatoes cost $2.40 per pound.

The correct statements are 'The equation 2n = p should be 2p = n' , 'The actual cost of the onions is $3.00 per pound' and 'Potatoes cost $1.50 per pound.'

Step-by-step explanation:

Here, p represents cost of one potato and n represents the cost of one onion.

And, According to the question,  He purchases 6 pounds of potatoes, p, and 3 pounds of onions, n, for $18.

Therefore, 6p +3n = 18    (1)

And, Onions cost twice as much as potatoes.

Therefore, n= 2p (2)

Putting the values of n from 2) in equation 1),

we get, 6p+3(2p)=18

⇒6p+6p=18 ⇒ 12p =18 ⇒ p = 1.5 dollar.

Thus cost of one potato= $1.5

And cost of one onion = $ 2× 1.5= $ 3.00

Thus with help of above explanation we can say that Options first, third and fifth are correct.

b

step-by-step explanation:

a difference is the result of subtraction. while each of these expressions has subtraction in it, a difference will be the result when subtraction is the last operation applied in the order of operations for the expression. this means subtraction must be outside of the parenthesis. only b has this.