The diameter of under the magnifying glasses is 6cm, so the actual size is 6÷5cm, the diameter is 1.2 cm
y-y1 = m(x-x1)
y-2 = 7(x-1) point slope form
y-2 = 7x-7
add 2
y=7x-5 slope intercept form
In the first position we have 10 possible numbers, and the same for the 2nd and 3rd positions becuase the numbers are replaced, so our answer is because of the multiplication rule.