You moved the decimal point but did not change the exponent of 10. Since you moved the decimal point another place to the left it should be [tex]1.035 \times {10}^{11} [/tex]
7.14×10(to the 10th power) +3.21×10(to the 10th power) _______ 10.35×10(to the power of 10) 10.35(move the decimal 1 to the left) 1.035×10(now to the power of 1)