If a = 4, b = 9, and c = -5.  find the value of:  ab + 24 ÷ 2c

To solve the expression ab + 24 ÷ 2c step by step, we first substitute the given values of a, b, and c into the expression.

So, ab + 24 ÷ 2c becomes 49 + 24 ÷ 2(-5).

According to the order of operations (PEMDAS/BODMAS), we should perform multiplication and division from left to right before addition.

First, we perform the multiplication: 4*9 = 36.

So, the expression becomes 36 + 24 ÷ 2*(-5).

Next, we perform the division: 24 ÷ 2 = 12.

So, the expression becomes 36 + 12*(-5).

Then, we perform the multiplication: 12*(-5) = -60.

So, the expression becomes 36 + -60.

Finally, we perform the addition: 36 + -60 = -24.

So, the value of the expression ab + 24 ÷ 2c when a = 4, b = 9, and c = -5 is -24.