Which of the following numerical expressions results in a negative number? A (−18)÷(−3) B (−57)+(−60) C (−18)−(−20) D (−4)×(−5)

B: (-57)+(-60)

Step-by-step explanation:

When you are adding a negative number, you are essentially subtracting. Therefore, (-57)+(-60) would have the same answer as -57-60, which is -117.

Let me know if this helped!

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.

answer: 48

just remember to use pemdas:

parentheses

expressions

multiplication

division

addition

subtraction