Question

What is the product of 1.5 and 2.8 is 4.2?

Answer 1

The product of 1.5 and 2.8 is correctly calculated as 4.2, in accordance with the rules of significant figures.

Step-by-step explanation:

The statement "1.5 and 2.8 is 4.2" seems to imply a multiplication between 1.5 and 2.8 resulting in 4.2. However, this is a misconception. The actual product of multiplying 1.5 by 2.8 is 4.2. To confirm this, you multiply the two numbers: 1.5 × 2.8 equals 4.2.

In significant figures, if the numbers 1.5 and 2.8 were part of a calculation with inexact numbers, the answer would be limited by the smallest number of significant figures present in the inexact numbers. In this case, as both 1.5 and 2.8 have two significant figures, the product is correctly expressed with two significant figures as 4.2.

Answer 2

2.8 x +1.5 = 4.2 (x – 10)
2.8 x + 1.5 = 4.2 (x – 10)
28 x/10 + 15/10 = 42/10 (x – 10)
28 x + 15 = 42 (x – 10)
28 x + 15 = 42x – 420
14 x – 405 = 0
x = 31.07