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3 years ago

64 is 4 times the difference between Sarah's age, a, and 44. Assume Sarah is older than 44.

Mathematics

2 answers:

Eva8 [605]3 years ago

4 0

Answer:

64 = 4*(a-44)

Sarah is 60

Step-by-step explanation:

64 is 4 times the difference between Sarah's age, a, and 44.

Is means equals and difference is subtraction

64 = 4*(a-44)

Divide each side by 4

64/4 =4/4 (a-44)

16 = a-44

Add 44 to each side

16+44 = a-44+44

60 = a

Sarah is 60

muminat3 years ago

3 0

Answer:

60 years old

Step-by-step explanation:

64=4(a-44)

64=4a-176

64+176=4a

240=4a

4a=240

a=240/4

a=60 years old

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Step 1; Assume that J collected $x, Keller collected $y and Izzy collected $z. All three combined collected $125.95, so

x + y + z = 125.95, take this as equation 1.

From the given data, the following equations can be formed.

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Step 2; Now we must determine x and y in terms of z, so that equation 1 can be solved (the equations can be in terms of any term x, y or z.)

Rearranging equation 2 and 3,

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Substitute z = 47.833 in equation 3.

y = 15 + 47.8333 = 62.4833.

Substitute y = 62.4833 in equation 2,

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If k=2

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Because, in her first try she has n possibles options and n-1 that are not correct, then, she has n-1 possibles options and 1 of that give her a successful login.

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