Hello i need help with questions 3 and 4. please and thank u.

  3.  28 feet

  4.  15

Step-by-step explanation:

3. Using r for the radius of the pond, we have a right triangle with sides r and 45 ft, and hypotenuse (25+r) feet. The Pythagorean theorem tells us ...

  (25+r)^2 = 45^2 +r^2

  625 +50r +r^2 = 2025 +r^2

  50r = 1400 . . . . . subtract 625+r^2

  r = 28 . . . . . . . . . divide by 50

The radius of the pond is 28 feet.

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4. The marks on the chord segments tell us the chords are the same length. Same-length chords are the same distance from the center of the circle:

  x = 15

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )

answer: x=3 and y=4

step-by-step explanation: