3
Work out the size of angle ADE.
Give reasons for your working.

140 degrees

Step-by-step explanation:

Because angle ABC is a right angle (90°), we got an equation: x + 10° = 90°

x + 10° = 90°

x = 90° - 10°

x = 80°

Angle DCB is: 2 x 80° - 20° = 140°

Also angle BAD is a right angle (90°)

Because the total sum of interior angles of a quadrilateral is 360°, that means angle ADC equals: 360° - (90° + 90° + 140°) = 40°

Because ∠ADC + ∠ADE = 180°, angle ADE equals: 180° - 40° = 140°

answer: 0+0=0

step-by-step explanation:

that is the only answer that can make 0

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116