I don’t know what this is

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

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?