If x = 4 and y = 5, calculate the increase in the product of (x + 1)(y + 1).

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Q1.

When both numbers a and b are each increased by 1, by how much does the product ab increase?

Q2.

Which property allows us to rearrange the factors in multiplication?

Q3.

If a = 5 and b = 3, how much does the product (a + 1)(b + 1) increase compared to ab?

Q4.

What is the product of two negative integers a and b?