Answer:
13.25 hours
Step-by-step explanation:
40x13.25+70=600
17+7x=x+5
6x=-12
x=-2
Hope it helps you
(7x+2)° = (9x–8)°
=>7x –9x = –8–2
=> –2x = –10
=> x = 10/2
=> x = 5
<ADB = (7x+2)°
= 7×5+2
= 37°
<BDC = (9x–8)°
= 9×5–8
= 45 –8
<ADC = 37° + 37°
= 74°
