What is the solution to the equation 1 over 21 multiplied by x is equal to 1 over 7?

x = 3
x = 14
x = 28
x = 147

the cost of 2 bottles of ketchup is $7.96. what is the cost of each bottle of ketchup?

$1.64
$2.65
$3.98
$5.96

an unknown number x is at most 20. which graph best represents all the values of x?

number line graph with closed circle on 20 and shading to the right.
number line graph with open circle on 20 and shading to the right
number line graph with closed circle on 20 and shading to the left.
number line graph with open circle on 20 and shading to the left