How would I calculate/measure angles without a protracter?

you would calculate angles with a protractor by using degrees.

Step-by-step explanation:

the center would be put at one corner and then u measure the side you want to know the angle of. hope this helped.

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !

where is the diagram? shown below where? ?

step-by-step explanation: