86 + 67
opposites
2*45 = 90
you add both of the two numbers together then divide the added number by the quantities of the items, in this case Two numbers and get the result. * * * * * The above is the arithmetic mean, which is quite different from the geometric mean. To get the geometric mean of n positive numbers, you multiply (not add) them together and take the nth root of the answer.
37 X 2 = 74
19. The two numbers are equal.
if you multiply 15 and 9 you get 145
-145
There are infinitely many pairs of numbers that can be multiplied to make 145. For example, 1*145, 10*14.5, 100*1.45, 5*29
145
25
20
-17
143
There are no two consecutive numbers that add or multiply to 102.
333
21
-1