Can You Pass an 11th Grade Calculus Class?

What's the square root of 81?

#knowledge

What are your thoughts on this subject?
179 Comments
saroja chandra
Q4 -- ginger ale question is poorly worded. Sqrt of 81 is indeed +9 AND -9
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Oct 16, 2021 3:23AM
Jan Ashbaugh
Rajnish Gautam, +-9 is correct
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Oct 9, 2021 10:13AM
John McLardie
Rajnish Gautam, the answer given of +-9 is correct since 81 has two roots +9 and -9.
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Oct 2, 2021 1:07PM
Martha Frantz Burger
Jerry Edwards, the bars on either side, indicate you solve for the absolute value which is nonnegative, so you use the positive. so, 5-18=-13 but |5-18|=13
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Sep 29, 2021 12:31PM
Martha Frantz Burger
Antonio Cobian, but the question states that one ginger ale was already taken randomly thus the number of bottles left is four not five
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Sep 29, 2021 12:24PM
Martha Frantz Burger
elfmaster, could also be negative answer, since multiplying two negatives = positive. in Q.6, the vertical lines around the equation mean to make the answer positive
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Sep 29, 2021 12:23PM
Rajnish Gautam
Many wrong answers like square root of 81 is 9 and answer given is foolish I.e. +9-9
7
Sep 11, 2021 2:22PM
Ken Brown
Absolute value. Andy Andrews,
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Sep 9, 2021 9:23AM
Ken Brown
there are two square roots of 81: 9 and -9. Jennifer Limpert Waldbauer,
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Sep 9, 2021 9:21AM
flanderschristy
9/10 The fact that I scored that high is a miracle! 4 of them I actually knew but the other 5 I guessed on with the help of the multiple choice answers. Am I crazy or were there more than 1 correct answer on a few of those?!
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Sep 2, 2021 9:15AM
Jennifer Limpert Waldbauer
In question #2 3/9 has the same value as 1/3 #10 The square root of 81 is 9
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Aug 9, 2021 8:10PM
billyboy915
Can someone explain to me where calculus enters into these algebra problems?
4
Jul 28, 2021 2:06PM
Linda Stegall
4/10 However I question the accuracy of some of the answers.
4
Jul 18, 2021 4:28PM
elfmaster
Q10 if 81 is a positive no., then the square should be 9, a positive no. Also on Question 6 should be -13, because if you subtract 18 from 5, you end up with a negative number.
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Jul 5, 2021 8:00PM
Blanche Templar
Andy Andrews, Thank you! I chose 9 ang got it wrong.
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Jul 1, 2021 11:26AM