An engineer is interested in the effects of cut- ting speed and tool geometry on the life in hours of a machine tool. Two cutting speeds and two different geometries are used. Three experimental tests are ac- complished at each of the four combinations. The data are as follows.

a. Interactions and tools are significant. Speed is insignificant.

b. The interaction effect masks the effect of cutting speed.

c. The high cutting speed has longer life for tools geometry 1 and the low cutting speed has low life for tool geometry 2.

Step-by-step explanation:

See pictures for step by step explanation.

Hope i was able to help, and please rate my answer as brainliest.  

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk

the graph in the attached figure

step-by-step explanation:

we have

using a graphing tool

the graph in the attached figure

the roots are ( x-intercepts) x=-0.5,x=1,x=3

the y-intercept is the point (0,3)