problem solving provide what is needed . show your solutions.


1: if the expressions -3xy - x2y2 + 1 is evaluated when x=-1 and y=-1, then what is its exact value?


2: What is the value of 2ab when a=1 and b=-2



3: Maria sold apples in the market. she used 6x +1 as a mathematical statement to describe the total number of apples sold the week. if she sold 70 apples on monday, how many apples did she sell after a week?




4: Mark has 3 different boxes of balls. the first box contains the number of ( x2 - 2xy ) balls while the second box is filled with the amount of ( 2xy - y2 ) balls. He decides to put all the balls together on the third box. How many balls are there in the third box?



5: Simplify ( 15x3y2/ 5x2y3) -2
by applying the laws of exponents.​