Find the output, y, when the input, x, is 4

Y=25-3x

13

Step-by-step explanation:

Y = 25 - 3x

X = 4

Y = 25 - 3(4)

Y = 25 - 12

Y = 13

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value