Robert spent $49.62 for six T-shirts which number sentence shows the best way to estimate the cost of each T-shirt

To estimate the cost of each T-shirt, you can divide the total amount spent by the number of T-shirts. In this case, Robert spent $49.62 for six T-shirts.

To estimate, you might round the total amount to $50 and use the number of T-shirts, which is 6. The number sentence for estimating the cost of each T-shirt would be:

\[
\frac{50}{6}
\]

You can also simplify this further by thinking about how many dollars each T-shirt would approximately cost. The estimation would result in about $8.33 per T-shirt when you calculate \(50 \div 6\).

So, the best number sentence to estimate the cost of each T-shirt is:

\(\frac{50}{6}\) or approximately \(8\).