Use the figure shown below to find the value of x

Acircle has a circumference of 28.36 units what is the diameter of the circle

Which table represents a linear function? i'll give brainliest to first answer ^'^

Jude is making cement for a driveway. the instructions show the amount of each ingredient to make 1 batch of cement. complete each statement to adjust the ingredients for each new situation if jude uses these instructions.