Six different types of acids are used in removing film from a machine part. A plant manager wants to test which acid removes the film in the least amount of time. Forty two machine parts are chosen, and each acid is used on seven different parts. The time it takes to remove the film is measured for each of the forty two parts. (a) Is this an observational study or an experiment? Explain why or why not. (b) If it is an experiment, give the treatments, experimental unit, and response variable.

what is the rest of the question? ?

answer: the center is the median and/or mean of the data. the spread is the range of the data. and, the shape describes the type of graph. the four ways to describe shape are whether it is symmetric, how many peaks it has, if it is skewed to the left or right, and whether it is uniform. good luck

step-by-step explanation:

the correct answer option is d. la = πrs.

step-by-step explanation:

we know that for a right cone, the lateral surface area is given by:

lateral area of right cone =

here the value under the square root is equal to slant height so replacing this value by in the formula to get:

lateral area of right cone =

therefore, the correct answer option is d.