Question

Please this is urgent I need help
Show workings

Answer 1

x=21.25

Explanation:

The lower two angles will be equal in an isosceles triangle and all angles in a triangle add up to 180 degrees so:

75+(2x+10)+(2x+10)=180

75+4x+20=180

4x=85

x=21.25

(both lower angles=52.5 degrees)

Proof:

52.5+52.5+75=180

Answer 2

47.5°

Explanation:

(2x+10)°+75°= 180°------ sum of angles of a triangle

or, (2x+10°)=180°-75°

or, (2x+10°)=105°

or, 2x=105°-10°

or,2x=95°

or, x= 95÷2

therefore, x=47.5°