Ineed with these questions
1: which orderly paired names the location of the library
2: which is the distance from the park to the post office

1 (-7,-5)

2 10 units

from what i can see, library is at (-7,-5)

park is at (6,5) and post office is at (6,-5)

both the park and post office are 5 units away from the x axis - therefore the distance between the two is 10 units

(a) the volume of the cone is 20/3 in3

hence, option a is correct.

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

radha is now 5 years old

3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !