Ethan ordered 4 sub sandwiches for a party. Each 1/2 sandwich is one serving. does he have enough to serve 7 friends? How much is leftover or how much more is needed? Explain. (i need help with this question on my math. I think the teacher wants to use reciprocals?) plz help. it is 6th grade (reciprocal) math.

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds

2.5 milligrams is equivalent to how many grams