Luca has 13 more crayons than Sam. If Luca has 42 crayons, how many crayons does Sam have ?

Sam has 29 crayons

Step-by-step explanation:

This problem does not really need to set up an equation to solve. We'll give the answer by simple logic deduction and simple calculations.

We know Luca has 13 more crayons than Sam. We can say that Sam has 13 less crayons than Luca.

Now we are told that Luca has 42 crayons. Considering the above relation found for the number of crayons Sam has, we can assure Sam has 42-13=29 crayons.

Conclusion: Sam has 29 crayons

answer:

c. the third graph

for this case we must apply distributive property to the following expression:

the distributive property states that:

then, when applying the property we have to multiply the -2 for each term within the parenthesis: