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.

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?