Question

evaluate the expression when a = -5 and c = 4. -9c + a

Explanation:

Step1: Substitute the values of \(a\) and \(c\)

We know that \(a = -5\) and \(c = 4\). Substitute these values into the expression \(-9c + a\). So we get \(-9\times4+(-5)\).

Step2: Perform the multiplication first

According to the order of operations (PEMDAS/BODMAS), we perform multiplication before addition. Calculate \(-9\times4\), which is \(-36\). Now the expression becomes \(-36+(-5)\).

Step3: Perform the addition

Adding a negative number is the same as subtracting its positive counterpart. So \(-36+(-5)=-36 - 5=-41\).

Answer:

\(-41\)