What is 5 – 7 × 9 + 3?

Answer 1

Based on the lack of parentheses, we would need to follow the PEMDAS rules for mathematics...

Parentheses

Exponentiation

Multiplication - Division

Addition - Subtraction

Since we have multiplication we need to do that first since that is higher in precedence order...

5 - 7 x 9 + 3 --> 5 - 63 + 3

Now we can work from left to right since addition and subtraction have the same precedence...

5 - 7 x 9 + 3 --> 5 - 63 + 3 --> -55