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arlik [135]
3 years ago
15

Aidan has four cards with +, –, ×, ÷ printed on them. He inserts them between the five numbers 5, 4, 3, 2 and 1 to form the expr

ession 5 + 4 × 3 – 2 ÷ 1, which has the value 15. Emma says: "Aidan put the operation cards in the order +, ×, –, ÷. If I place the operation cards in a different order between the numbers 5, 4, 3, 2, 1, I can make the value equal to 19." In what order did Emma place the four operations?
Mathematics
1 answer:
dlinn [17]3 years ago
5 0

Answer:

5 x 4 + 2 - 3 / 1

Step-by-step explanation:

This took me so much tries to do but got it. Hope it helps! :)

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Elena-2011 [213]

surface area (S) of a right rectangular solid is:

S = 2*L*W + 2*L*H + 2*W*H (equation 1)

where:

L = length

W = width

H = height

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you have:

L = 7

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formula becomes:

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answer is:

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to prove, substitute any value for a in equation 2:

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since a = 15, then W = 15 because W = a

go back to equation 1 and substitute 15 for W:

S = 2*L*W + 2*L*H + 2*W*H (equation 1)

where:

L = length

W = width

H = height

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you have:

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equation 1 becomes:

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equations are good.

formula for surface area of right rectangle in terms of a is:

S = 22*a + 56

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