Answer:
7, 10
Step-by-step explanation:
7 and 10 appear in each set of numbers
Hello! I believe the answer to your question is C (hours). If t is the amount of time it takes, hours is a unit of time, therefore I assume that would be your answer. :)
AC is perpendicular to BD
so
3x + 9 = 90
3x = 81
x = 27
answer
x = 27
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in case if you need to find y
2x + y = 90
2(27) + y = 90
54 + y = 90
y = 90 - 54
y = 36
A. 20. plug 20 in to both equations and they will be equal to eachother