Mike spent half of his allowance playing acrade games his parents let him wash the gutters for 5.80 if he ended with 12.20 what is his weekly allowance

Weekly allowance (W) = 12.80

Step-by-step explanation:

Given:

Ended amount = 12.20

Amount for guitar wash = 5.80

Find:

Weekly allowance (W)

Computation:

W + 5.80 - W/2 = 12.20

W + 5.80 - 0.5W = 12.20

0.5 W = 6.4

Weekly allowance (W) = 12.80

step-by-step explanation:

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