Help please please and thank you

9514 1404 393

  40 minutes

Step-by-step explanation:

The lines are graphed. The point of intersection (A) is where the two sign makers will have made the same number of signs in the same number of minutes. The answer to the question is the x-coordinate of that point, 40 minutes.

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The equation you want to solve is the one that sets Kiran's y-value equal to Lin's y-value

  y = y

  1/2x +5 = 1/4x +15

  1/4x +5 = 15 . . . . . . . . subtract 1/4x

  1/4x = 10 . . . . . . . . . . . subtract 5

  x = 40 . . . . . . . . . . . . multiply by 4

At 40 minutes, both will have the same number of signs made.

Alternate solution

Often, you are told to "clear fractions" as a first step in solving equations containing fractions. Here, you would do that by multiplying both sides by 4.

  1/2x +5 = 1/4x +15

  2x +20 = x + 60 . . . . . multiply by 4

  x + 20 = 60 . . . . . . . . . subtract x

  x = 40 . . . . . . . . . . . . . subtract 20

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2

you cant answer this dummy

step-by-step explanation: