Ahomework question says that the angle of depression from the bottom of a house window to a ball on the ground is 20 degrees below is your friends sketch of the situation describe your fruends error

He marked angle of depression in the wrong side.

Step-by-step explanation:

Angle of depression : If someone stands and looks down at an object, the angle of depression is the angle between the horizontal line of his sight and the object.

If point O shows the bottom of a house window, A shows the position of ball and OX is the horizonal line.

Then,  By the definition of angle of depression,

Angle XOA is the angle of depression from the bottom of a house window to a ball on the ground.

That is,

step-by-step explanation:

system of linear equation

step-by-step explanation:

as given in the data

a= 20 , b= -12

let us suppose that it is a straight line equation

now we know the formula for the system of linear equation

b= ma + c )

here m is slope of a straight line which is equal to formula

m=   (ii)

and here c is a constant

now putting the value of a and b in equation (ii)

m=

m=

putting the value of a,b and m in equation (i) gives us

-12 = + c

-12=-12 + c

adding 12 to both sides

-12 +12 = -12 +12 +c

0 =c

or c=0

as the value of the constant is zero which gives us that it is a linear equation and this order pair satisfies the system of linear equations.