$7^2$72 is equal to which of the following?
$72$72
$7\times7$7×7
$2\times2\times2\times2\times2\times2\times2$2×2×2×2×2×2×2
$7\times2$7×2
Which three of the following numbers are perfect squares?
Evaluate $4^2$42
Evaluate $9^2$92
Calculation of powers and roots.