Which of the following transformations will always produce a congruent figure?
a.
expansion
b.
contraction
c.
dilation
d.
reflection

Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?