Find the probability of selecting a multiple of 2 or a multiple of 3 from the integers 1-20

What is the lcm of 16 and 40 ? 24 and 40 ?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?