Math questions help = )

Test Preparation SAT Preparation
1

  1. in the xy plane a circle with radius two has its center at point (3,5)
    when the circle is reflected across the x axis its image is another circle what is the distance between the centers of the two circles?
    A) 4
    B ) 6
    c) 8
    d) 10
    e) 14

  2. to get the most benefit from exercise it is recommended that a person attain a heart rate measured in beats per minute that is between 60 percent and 75 percent of the value obtained by subtracting the person’s age from 220 what is one of the possible heart rate,in beats per minute, recommended for a 20 year old jogger?

thanks in advance = )

2

Why don’t you try to answer the questions and show how far you’re. Those questions are very basic.

3

@xiggi‌ i solved the first and i got it wrong.
and the second no need for it i understand it now.

4

The first one is pretty straightforward if you draw it out correctly. Hint: the radius of the circle is irrelevant.

5

Think about what it means for something to be reflected over the x-axis. Everything above the x-axis will be below the x-axis, and vice-versa. You are effectively changing the y-value. So the point will go from (x, y) to (x, -y). From there you should be able to figure out the distance.

6

ohhhh i was getting the distance between the two circles not the centers!
sorry guys xl
thanks all

7

Yep, that’s why I said in the other thread, read carefully.