Step-by-step explanation:
the angle CDB is the supplementary angle to 9x+10 (angle ADC).
that means they stand together for 180°. as all angles around a single point on one side of a line are together always 180°.
and then, the sum of all angles in a triangle is always 180°.
so,
CDB + (4x + 10) + 50 = 180
CDB = 180 - (9x + 10) = 180 - 9x - 19 = 170 - 9x
therefore,
(170 - 9x) + (4x + 10) + 50 = 180
170 - 9x + 4x + 10 + 50 = 180
-5x = -50
5x = 50
x = 10
angle CDB = 170 - 9x = 170 - 90 = 80°
I'm assuming you're subtracting. It would be 3.9. The second one would be 0.65.
The linear equation has an equal signed involved and the expression doesn’t.
A 150% markup of a picture frame that costs 2.99 would cost : 4.49
What i did is that i did $1.50 time 8 = $12.00 and then do $30.00-12.00=$18.00
