1. Write the algebraic expression for the following cases :
a)The product of b and c subtracted from the product of 5 and a.
b)The product of x and 2y divided by 7.
2. Write the coefficient of x in the following expression
a) 3x2y+3xy2+y3
(b) xyz+8x+10x2
3. Find the sum of a2-7ab+b2 and 8ab-7b2-3a2 by arranging the terms in columns.
4. From the sum of a3-7a+10 and 3a2+4a-15,subtract 2a3+a-9.
5. What must be added to 7x2+3xy-y2 to get -x2+2xy+y2 ?