When solving multi-step equations we do them in what order? A reorderable list of 4 items is on the screen. Arrange items so that First step is at the top and Last step is at the bottom. Tab to the listbox, and press the Up and Down Arrow keys to move, and the Spacebar to select or unselect an item.
FIRST STEP
Parenthesis
Addition and Subtraction
Exponents
Multiplication and Division
LAST STEP

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

55/i dont know i do it for the points

step-by-step explanation:

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