S+D+K=155
K=S+10
D=S-20
--------------------------------
S+(S-20)+(S+10)=155
S+S-20+S+10=155
3S-10=155
3S=165
S=165/3=55
---------------------------------
If S=55,
K=55+10=65
D=55-20=35
---------------------------------
Therefore, Sarah had worked for 55 hours, Kate had worked for 65 hours and Dave had worked for 35 hours.
Answer:
400
Step-by-step explanation:
20 divided by 200
then you would use that answer to simply the addition or subtraction
You would also need too use that same expression put it into an fraction
then use it for the equation
If we find the square root of 13 ans 14 we get
sqrt(13) = 3.60555 <span>
sqrt(14) = 3.74166</span>
All Real numbers can be rational number and
irrational number.
<span>We can write 3.7 as 37/10, which is the easy
rational number and an irrational number within the range is sqrt (27/2)</span>
<span>Real number system is used in mathematics and statistics.</span>
Answer:
B)
Step-by-step explanation:
If this answer helped you then please consider making this brainliest and thank this response :)
Answer:
6 book purchases.
Step-by-step explanation:
As the bookstore sells frequent buyers discount cards at $ 12, which make the books that usually cost $ 9 cost $ 7, to determine from how many books a card-holder and a common buyer will spend the same amount of money is necessary perform the following calculation:
9 - 7 = 2
12/2 = 6
Therefore, after purchasing 6 books, both categories of buyers will have spent the same amount of money. This is verified with the following calculation:
Card holder = 12 + 7 x 6 = 54
Non-card holder = 9 x 6 = 54
