c because 7 to the second power is 49 instead of 14 when you power 7 to the 2nd power you are doing 7×7 not 7×2 You multiply the number times itself when you have an exponent by the number for example 6to the 2nd power 6×6 because it is to the 2ND power so 2 but if it was 6 to the 3rd power then 6×6×6
