What is the simplified form of the following expression?

6c2 + 2.5d - d + 2c2 -3d

a. 4c2 - 1.5d
b. 6c2 + 0.5d
c. 8c2 -1.5d
d. 8c2 + 1.5d

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?

Ill mark the brainliest if you me with the these three questions 7,8,9

What are the solutions of the system? y = x^2 + 2x +3y = 4x - 2a. (-1, -6) and (-3, -14)b. (-1, 10) and (3, -6)c. no solutiond. (-1, -6) and (3, 10)