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AysviL [449]
3 years ago
15

How old was Lisa x years ago if she is now 13? Which expression represents this?

Mathematics
2 answers:
svlad2 [7]3 years ago
7 0

Answer:

a = 13 - x

Step-by-step explanation:

Age = a

(Any other letter of substitution for age would be fine)

For example if x was 5 :

a = 13 - 5

a = 8

For further study:

  • Research algebra on either website. (eg: Maths Is Fun, Khan Academy...)
gogolik [260]3 years ago
6 0

Answer:13-x= y

Step-by-step explanation:

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Mrs. Speas has $138 in her bank account during Week #1. At the end of each week, she deposits $55 into her bank account. What is
nordsb [41]

The first term is 138

The difference is 55

The iterative rule for the amount of money Mr Speas has after n weeks is

55/2 n² + 221/2 n

During the first week she has $138 in his bank account. At the end of each week she deposited $55 into her bank account.

The first term will be 138 .

The common difference is 55 because her bank always increase by $55 dollars every week. The sequence will be 138, 193, 248, 303, 358...…

The difference = 193 - 138 = 55.

The iterative rule for the amount of money Mr Speas has after n weeks can be represented  below

n = number of weeks

a = first term = 138

d = common difference = 55

Using AP formula,

sₙ = n/2(2a + (n - 1)d)

sₙ = n/2 (2(138)+ (n - 1)55)

sₙ = n /2(276 + 55n -55)

sₙ = n /2(221 + 55n)

sₙ = 55/2 n² + 221/2 n

read more: brainly.com/question/20373665?referrer=searchResults

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marusya05 [52]

Answer:

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9+33-6

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I think it’s the second option
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Answer:

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