Cooper drove his car for 2 hours at a constant speed of 60 miles per hour and then for another 30 minutes at a constant speed of
2 answers:
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Answer:
x=4.34 seconds
Step-by-step explanation:
-16x^2+70x-2=0
x=4.34
The number of questions in the test is 30
Step-by-step explanation:
Let's call the total number of questions in the test N.
We know that Laura answered 27 questions, and these 27 questions represent the 90% of the test.
Therefore, we can say that 27 is the 90% of N.
Re-writing the percentage as a fraction,
This means that:
And now we can solve for N to find the number of questions in the test:
Learn more about percentage:
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