Question

80. If a- b2 = 13 where a and b are natural numbers,
then value of a is
(a) 6
(b) 7
(c) 8
(d) 9​

Answer 1

Step-by-step explanation:

The lithosphere serves as a source of minerals.

The minerals supply the basic materials required for making a variety of commodities, which man uses daily.

The lithosphere is also the major source of fuels such as coal, petroleum and a natural gas.