If EG=67 we have (3x+7)+(5x-4)=67
let's simplify

now we know x is 8 we can use this to find EF
since EF=3x+7

so we have EF is 31!
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Answer:
a)
, b) 
Step-by-step explanation:
a) The rate of change of the brightness of the Cepheid can be determined by deriving the function in time:


b) The rate of increase after one day is:


Answer:
119.666
Step-by-step explanation:
3 goes into 359 119.666 times.