Which expression is equivalent to 3(7x − 5)?
A) 10x − 15
B) 10x − 8
C) 21x − 15
D) 21x − 8

Can any one me with the answers to these questions asap?

Bobs burgers bam has a special deal of 4 hamburgers for $6. at that rate, how much should it cost to buy 3 hamburgers?

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project