6. Write the following multiplications as exponential abbreviations.
a. 5 x 5
b. 7 * 7 * 7 * 7
c. 2 x 2 x 2
d. 9 x 9 x 9 x 9 x9
7. Write the values of the following exponential abbreviations.
a. 33
b. 142
c. 125
d. 90​