2. combine like terms
-21a + 16a
a.-5a
b.5a
c.37a
d.-37a

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total