Which expression is equivalent to (n + 12) x 5+7n

The required expression is 7n²+89n+60

Step-by-step explanation

To get the expression, we will multiply the two linear expression by opening the bracket to give a quadratic equation.

(n + 12) x (5+7n)

We will use the variable and the constant of n + 12 to multiply that of 5+7n to give;

(n + 12)(5+7n) = 5n + 7n² + 60 + 84n

Rearranging the equation gotten we will have;

7n²+84n+5n+60

= 7n²+89n+60 which is the required quadratic expression.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

whatvare the choices

step-by-step explanation: