Question

plspls ans correct......​

Answer 1

Answer:

Q1

a=20

d=-3

an=-1

an=a+(n-1)d

-1=20-3n+3

-4-20=-3n

-24=-3n

n=8

Q2

Using distance formula

Coordinates of point A=(2,3)

Coordinates of point B=(x,0)

Distance of AB=3

Distance of AB=$\sqrt{(x-2)^{2} +(0-3)^{2}}$

3=$\sqrt{x^{2}+4-4x+9 }$

sq. both sides

9=x²-4x+13

0=x²-4x+4

0=x²-2x-2x+4

0=x(x-2)-2(x-2)

(x-2)(x-2)=0

x=2