Answer:
D
Step-by-step explanation:
4x²= 32
x²= 32 ÷4 <em>(</em><em>÷</em><em>4</em><em> </em><em>on</em><em> </em><em>both</em><em> </em><em>sides</em><em>)</em>
x²= 8
x= ±√8 <em>(</em><em>square</em><em> </em><em>root</em><em> </em><em>bith</em><em> </em><em>sides</em><em>)</em>
☆ A '±' symbol has to be added whenever we introduce a square root as the square of any number, positive or negative, would result in a positive number.
Answer:
55 - you multiplied 6 by 11 to get 66 so you multiply by 5 by 11 to get 55.
1.
List the scores:
(2) 60
(1) 65
(5) 75
(1) 95
(1) 100
Find the chart with those quantities: Chart A
2. Find the mean:
75 + 60 + 75 + 100 + 75 + 75 + 75 + 95 + 60 + 65 = 755
755/10 = 75.5
Subtract the mean from Ashley’s score:
60 – 75.5 = -15.5
The answer is D.
There is a lot to go over here. Unfortunately it looks like you got a lot incorrect. I'll focus on two problems. Hopefully these examples below will help correct the other mistakes.
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Problem 7)
We have the starting value be 20 and the ending value be 11. Subtract the values: (end)-(start) = 11 - 20 = -9. The negative indicates we have a drop or decrease.
We'll focus on the positive version of this number, so 9. Divide this value over the starting amount 20 to get 9/20 = 0.45 = 45%
So going from 20 miles to 11 miles is a decrease of 45%
Answer to problem 7 is: 45%
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Problem 13)
An increase of 300% means we added 3 times the original amount onto the original amount.
We take 300% of 25 to get 3*25 = 75
Which is then added onto 25 to get 25+75 = 100
Answer to problem 13 is: 100
<em>*It's debatable that there are 2 answers to this question because of how it's worded*</em>
For the first answer:
There would be 66 books left.
To get this, you need to multiply the original amount (120) by the decimal form of the percentage.
So, to get the decimal form you need to divide by 100, which essentially means you move the decimal 2 places to the left.
55% then becomes .55
So, 120 * .55 = 66
For the second answer:
If the question means that you need to decrease 120 by 55% <em>of 120 </em>then the answer would be 54.
120 - 66 = 54
So, depending on the answer choices and how it's interpreted, do what you will with this information.