How do i do this?

f(a)=4a+5; find f(2)

In two or more complete sentences, formulate how to use technology to calculate the appropriate regression model for the given data. you are not required to find the model, just choose the appropriate regression and explain how to use the technology. (-5,,2.,0.8), (0,-0.5), (2,-1.3), (3,-0.8), (5,2)

Find the value of x for which line a is parallel to line b

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)