Answer:
1.)
Step-by-step explanation:
When driving downwards, that is negative because you are subtracting. Then, when driving upwards, you are adding.
The expanded algorithm is given as follows:
4 x 57 = (4 x 50) + (4 x 7) = 200 + 28 = 228
The standard algorithm is given as follows:
Step-by-step explanation:
-3(-x -3y) = 3( x +3y) = 3x+9y
10 is a common factor of 50 30 and 100. So is 2