Answer
The total cost is $5.46
Work Step by Step
Let x = toothbrush's price
y = tube's price
t = added tax
P = total cost
You buy a toothbrush for $\$2.83$ and a tube of toothpaste for $\$2.37$. There is a $5\%$ sales tax. Therefore:
$P=x + y +t$
$P=(2.83+2.37)\times 0.05 + 2.83 + 2.37$
$P=0.26 + 2.83 + 2.37$
$P=5.46$