can someone help with problems 22, 23 & 25

#22: 10.2 gallons for $2.59 each = 10.2 x 2.59, which rounded is $26.42.
#23: 12 pieces that are 6.45 in wide each = 12 x 6.45, which is 77.4 in.
#25: Aaron started with $38.
$22.47 + $8.53 + $6.50 is $37.50.
38.00 - 37.50 is .50 or 50 cents.
Hope that helps!