Can You Pass an 11th Grade Calculus Class?

What's the square root of 81?


What are your thoughts on this subject?
saroja chandra
Q4 -- ginger ale question is poorly worded. Sqrt of 81 is indeed +9 AND -9
Oct 16, 2021 3:23AM
Jan Ashbaugh
Rajnish Gautam, +-9 is correct
Oct 9, 2021 10:13AM
John McLardie
Rajnish Gautam, the answer given of +-9 is correct since 81 has two roots +9 and -9.
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
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
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
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
Sep 11, 2021 2:22PM
Ken Brown
Absolute value. Andy Andrews,
Sep 9, 2021 9:23AM
Ken Brown
there are two square roots of 81: 9 and -9. Jennifer Limpert Waldbauer,
Sep 9, 2021 9:21AM
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?!
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
Aug 9, 2021 8:10PM
Can someone explain to me where calculus enters into these algebra problems?
Jul 28, 2021 2:06PM
Linda Stegall
4/10 However I question the accuracy of some of the answers.
Jul 18, 2021 4:28PM
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.
Jul 5, 2021 8:00PM
Blanche Templar
Andy Andrews, Thank you! I chose 9 ang got it wrong.
Jul 1, 2021 11:26AM