Please help me with those questions please please help me with those questions please help

Which of the following is the shape of a cross section of the figure shown below

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?

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x