A keyboard that costs $400 is marked down 10% for a sale. What is the total savings? What is the new price of the keyboard?

The total savings is $40 and the new price is $360

Step-by-step explanation:

Multiply 400 by .10 and you get the savings, $40.

Then subtract 400 by 40 and you get the new price.

Step-by-step explanation:

400*0.10=40

400-40 because 40 is the savings and 400 is the total price

400-40= $360 is the new price

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

the radius is 2 times the diameter.

step-by-step explanation: