Prove ABCD is a parallelogram. HINT: Look for two congruent triangles that will allow you to find congruent angles...)

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Solve the equation. 2x - 8(x+1)= 6(2x - 3)

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?