HELP PLEASE D: ASAP!

If a student gets 30 problems right to earn a grade of 75 on a test, with every problem worth the same points:

a) How many questions did another student get right if she earned a grade of 90?

b) How many questions were on the test, if a grade of 100 was the highest possible score (Round to the nearest whole number) ?

c) How many points is each question worth? points (Put your answer in decimal form)

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225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

step-by-step explanation:

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