write an equivalent expression for 7 to the 12 power times 7 to the second power

Answer 1

7^12 x 7x^2

= 7^(12+2)

= 7^14

=about 6.782230728 x 10^11

= about 678,223,072,809 (last digit should be either a 1,3,7,or 9. 7x7=49, 49x7 = 343, 343x7 = 2401, then the 7, 9, 3,1 pattern continues. 7^a where a is divisible by 4 will end in 1. 14/4 =3 plus remainder of 2. 7^14 will end in a last digit of 9,

= about 678 billion