a spacecraft can operate its television cameras for 1000 hours on its batteries and can run its radio transmitter for 2,000 hours or I can use its heater for 500 hours how long can the spacecraft function with all three units in operations simultaneously?​

we know that

1) the inscribed angle measures half of the arc it comprises.

so

m∠dgf= > expression

2) the opposite angles in an inscribed quadrilateral are supplementary angles

so

m∠dgf=

m∠dgf=°

substitute in the expression to find the value of arc ef

therefore

the answer is

the measure of the arc ef is

d. 5.43x1012 h.5.43e12