R=26, you can use cross multiplication to figure this proportion out. 22 times 13 is 286 and 11 times r is 11r , leaving you with 286=11r. you would then divide each side by 11 to isolating the variable giving you r=26.
$19/1.05= $18.095 rounds to $18.10
The sale tax on the item is $0.90
8% I am sorry if I am wrong
This is what I got for the answer.
25 problems and you have done 20%
= 20/100 * 25
= 0.2 * 25
= 5
You have done 5 problems out of 25
