The points A and B of a rectangle ABCD belong to the graph of the function f(x)= 1/2x^2+a while point C(2,0) and D belong to the x-axis. Find a if the area of ABCD
2
is 24 square units.

a=4; a=-8

Step-by-step explanation:

Im not very good at explaining so it should be in the picture.

-Goutham

40 miles per hour is faster.

Step-by-step explanation:

First we have to find how many feet per hour the second car is going.

There are 60 seconds in a minute, and 60 minutes in an hour.

50*60=3600

There are 3600 seconds in a hour.

50*3600=180000

This means that the second car going 180000 feet per hour.

1 mile is 5280 feet.

Now we have to figure out how many miles 180000 is.

We can do that by setting up the following expression.

180000/5280=34 1/11 or 34.09

Since 40 is greater than 34.09, it is faster to drive a car going 40 miles per hour.