Answer:
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MATH REVIEW: USEFUL MATH FOR EVERYONE
SECTION 1.2. RATIOS AND PROPORTIONS
Ratios and Proportions
Algebraic Expressions
Exponents
Logarithms
Glossary and Links
back to Ratios, Page 1
A proportion is similar to a ratio, except that it indicates a part of a whole, and so the numerator arises from the denominator. For instance, a researcher might say that, for every ten students in the residence hall, five were women. Five over ten (5 / 10) is a proportion. Proportions must have all of the numbers in the same units, and are frequently written as fractions.
What happens when you want to write a proportion, but the numbers are given in different units? Suppose you were asked to write the proportion of 3 cups to 56 ounces (3 cups out of 56 ounces). You must write a proportion of either cups to cups (cups:cups) or ounces to ounces (ounces:ounces), so you will have to convert one of the numbers so that both numbers are expressed in the same unit of measurement. Let's convert cups to ounces so we can express the ratio as ounces:ounces. Since there are 8 ounces in one cup, 3 cups are equal to 24 ounces:
3 cups * 8 ounces/cup = 24 ounces
Now the two numbers 3 cups and 56 ounces can be written as the following ratio:
24 ounces to 56 ounces,
24:56,
or, now that the unit of measurement is the same, 24:56 can also be written as a proportion:
24/56
You may need to solve some problems involving ratios.
If you divided 36 into two parts in the ratio of 1:2 and one part is a and the other is b, you can find the value of a and b:
You know that
a+b = 36
And
a/b = 1/2
You can use these equations to solve for a and b, or you can use the following simple method:
Find out how many units are in 1 part of the ratio. To do this, divide the total by the number of parts.
Number of parts: 1 + 2 = 3.
Number of units in each part: 36/3 = 12.
Then, multiply the number of units in each part by the number of parts in each variable.
a = 1 * 12 = 12
b = 2 * 12 = 24
As an aside . . .
Percentages are so frequently used that we should spend a little time on them here. The powerful thing about percentages is that they all have the same denominator: 100. When two fractions have the same denominator, comparisions can be made very easily.
0.21 = 21% = 21 / 100
Step-by-step explanation:
PLEASEE HELP ME
Which conjecture is valid by the Law of Syllogism for the following scenario? “If Joe buys Nancy a card, he will give it to her. If Nancy is having a birthday, then Joe will buy her a card.”
A If Nancy is having a birthday, then Joe will give her a card.
B If Joe buys Nancy a card, then she is having a birthday.
C If Joe gives Nancy a card, then he bought the card.
D If Joe gives Nancy a card, then she is having a birthday.
A rectangle has a width of 6 in a perimeter has 26 in what is the length of the rectangle
Answer:
7
Step-by-step explanation:
Which expression is equivalent to 9 + 0.5y – y - 0.5 ?
9 - y
-0.5y – 9.5
-0.5y + 8.5
0.5y + 8.5
Answer:
-0.5y + 8.5
Maybe?
anyone know the answer ?
-4x+7. x= -1 (show work)
Answer:
Step-by-step explanation: -4(-1)+7 = 11
Answer:
11
Step-by-step explanation:
-4x+7
plug in -1
(-4)(-1)+7
mutilpiy negative 4 and negative 1
4+7=11
help please this is due in a couple minutes easy work
Answer:
first one is 123
second one is 106
third one is sally
Step-by-step explanation:
Answer:
Mary
Step-by-step:
(a) 252-129/11-8= rate of change: 123/3
(b) 2,3 or 56
(c) Mary
Hope it's good information good luck... :)
Which of the following sets of coordinates represents a triangle that is congruent to the one graphed below?
A. S(1,1), T(1,5), O(-3,1)
B. E(6,-2), F(6,3), G(9,3)
C. F(0,1), L(0,4), A(4,1)
D. G(1,1), E(2,4), M(5,4)
Answer:
its c because it is I know
On Cyber Monday, a pair of shoes that normally costs 119.00 is on sale for 79.99. What is the percent decrease?
Answer:This is the only thing that i can tell u sorry but i hope this helps
Step-by-step explanation:
Subtract starting value minus final value
Divide that amount by the absolute value of the starting value
Multiply by 100 to get percent decrease
If the percentage is negative, it means there was an increase and not an decrease.
Percentage Decrease Formula
You can use the percentage decrease formula for any percent decrease calculation:
Percentage Decrease=Starting Value−Final Value|Starting Value|×100
Step-by-step explanation:
I need help please???
Answer:
(-7 and 3) (-5 and 1) (-3 and -1)
Step-by-step explanation:
If you add all of them you get -4.
Answer:
1st pair: -7 and 3
2nd pair: -5 and 1
3rd pair: -3 and -1
Step-by-step explanation:
They all equal -4
pls help this is due tmrw and i actually suck at math
Solve the following system of equations using substitution. Show ALL of your work and write the ordered pair in the space provided. y = x - 1 y = 2x + 1
Answer:
substitution method would go as follows
5x-2=7x-8 we than rearange it so it becomes 5x-7x=-8-2 this than becomes -2x=-6 so x=3
we can than substitute 3 for x in one of the first equations
y=7 times 3-8 = 21-8 = 13
so therfore the interception should be at 3,13
Step-by-step explanation:
!!Please Helppppppp ASAP!! ):
Which is the constant of proportionality for the relationship shown in the table?
x y
4 2
7 4
10 6
13 8
A. 32
B. 23
C. 3
D. 2
Answer:
A.)32
Step-by-step explanation:
x is increasing by 3 while y is increasing by 2
This is a sort of guess so I hope its right
Answer:
A.)32
Step-by-step explanation:
x is increasing by 3 while y is increasing by 2
I hope it helped
Oscar ran the 100-yard dash in 12.58 seconds. Jesiah ran the 100-yard dash in 11.59 seconds.
How many seconds faster was Jesiah's time than Oscar's time?
Answer:
0.99
Step-by-step explanation:
Six friends go to the local sandwich shop. All six people order the combination meal, which includes a drink and a veggie wrap for $4.95. One person thinks the total bill for all six friends will be around $20.00
Is that a reasonable estimate? Why?
A. No, a reasonable estimate is around 6 times $7 = $42
B No, a reasonable estimate is around 5 times $6 = 30
C. No, a reasonable estimate is around 10 times $5 = 50
D Yes, a reasonable estimate is around 4 times $5 - $20
please help and don't just do for points
Answer:
c?
Step-by-step explanation:
B. No, a reasonable estimate is around 5 times $6 = $30
The total bill for all six friends can be estimated by multiplying the number of friends by the cost of the combination meal. Since there are six friends and each combination meal costs $4.95, the reasonable estimate for the total bill would be:
6 friends * $4.95/meal = $29.70
Since option B suggests a reasonable estimate of $30, which is very close to the calculated estimate of $29.70, it is the most appropriate choice. Option A suggests a much lower estimate than the actual cost, option C suggests a much higher estimate, and option D suggests a lower estimate without considering the actual cost of the meal.
Therefore, option B is the best choice for a reasonable estimate of the total bill for all six friends at the sandwich shop.
To know more about multiplying :
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I KNOW IT IT LONG BUT PLEASE HELP ME PLEASE
QUESTION: How does the Indian reservation have an effect on the right of occupancy
THESE ARE MY NOTES THE ANSWER IS IN IT
Neither the Secretary of the Interior, Congress, or any other branch of government, has the Constitutional power to disregard the Right of Occupancy and this fact is settled government policy. Congress has recognized Original Indian Title in several state enabling acts (or acts of Congress officially creating/recognizing a state) by requiring the incoming state to disclaim all right and title to lands owned or held by any Indian or Indian tribe. From our class discussion on Discovery, what the Treaty of Guadalupe Hidalgo transferred to the United States was the right to purchase/conquer the lands of that territory from tribes (the Federal Government cannot grant what it does not have). Where no land cession has been freely made by a tribe, Original Indian Title remains unaffected. So, the second right of Original Indian Title is to transfer that title to the sovereign possessing the right of Discovery. When the United States would attempt to purchase land of Native Americans, “Indian reservations” were created by removing those lands from the purchase so the tribe would continue to hold Original Indian Title within those boundaries.
Original Indian Title contains two very basic rights, the right to occupy the lands involved and the right to sell those lands to the government who possesses the right of Discovery. Though the United States had the right to conquer Native American lands to claim possession, the fact is that the common approach was to avoid military conflict and to purchase those lands instead.
The policy of the government Indian right of occupancy is as sacred as the feet and can be interfered with a termiated only by the United States
Step-by-step explanation:
Answer:
The policy of the government Indian right of occupancy is as sacred as the feet and can be interfered with a end only by the United States
Read the excerpt below and answer the question that follows.
At a place where there were no signs, where the soft, unbroken snow seemed to advertise solidity beneath, the man broke through. It was not deep. He wet himself halfway to the knees before he floundered out to the firm crust.
What does floundered mean?
Being in a nearly extreme struggle and in this case because he was in a place where no signs indicate him anywhere.
Brainliest.....ANSWER PROPERLY!!!!! Thx :D >3
Answer:
1280
Step-by-step explanation:
Answer:
2.4
Step-by-step explanation:
0.16 (Bald Eagles amount) times 5= 0.8. The river otter drink 0.8 liters a day. Multiply that by 3 to get 2.4. The river otter drinks 2.4 liters in 3 days.
Hope this helps!
10 points for it.Math please
Answer:
e
Step-by-step explanation:
The Sanford brothers are all separated by the same number of years. The sum of their ages is 36. Maurice is three times older than his youngest brother. Ray is twice as old as his youngest brother, Paul. How old is each brother?
Answer:
the youngest should be 5 next 10 and oldest 15
Step-by-step explanation:
may i plz get brainliest if right?
im sorry if wrong
A tank containing 35 gallons of water is leaking at a rate of 1/4 gallon per minute. Write an expression to determine the number of gallons left in the tank after m minutes.
Choose the equations in which n=100
will make the equation true.
1:12.4 divided by n=0.124
2:3.8 divided by n=0.038
3:52350divided by n=52.35
4:850.4 divided by n =85.04
5:0.41 divided by n =0.0041
Answer:
1, 2, and 5 would make the equation true
Step-by-step explanation:
1) 12.4/100 = 0.124 is CORRECT
2) 3.8/100 = 0.038 is CORRECT
3) 52350/100 = 52.35 is INCORRECT, the correct answer is 523.5
4) 850.4/100 = 85.04 is INCORRECT, the correct answer is 8.504
5) 0.41/100 = 0.0041 is CORRECT
Therefore, answers 1, 2, and 5 would make the equation n = 100 true.
Answer:
1 ,2,5
Step-by-step explanation:
What is 4/5 divided by 10?
A)4/50 or 2/25
B)50/4 or 12 1/2
C)5/40 or 1/8
I WILL GIVE BRAINLIST, DUE IN 15 MIN
Answer:
$34.50
Step-by-step explanation:
At 3.45 for 3/4 pounds that = to 4.60 for 1 pound.
4.60 *7.5 pounds= $34.50
A 210 inch board is cut into two pieces. One piece is four times the length of the second piece. How long is the shorter piece?
Answer:
short piece is 42 inches :)
Step-by-step explanation:
An ice machine uses 3 gallons of water every 9 hours. How much water does it use each hour!!
Answer:
A i think?????.....................................
Step-by-step explanation:
Sandy has earned $290. That is 20% of the cost of the new computer she wants to buy. What is the total amount of money she needs to buy the computer?
A. $1160
B. $1740
C. $1450
D. $58
Answer:
1450
Step-by-step explanation:
If it is 20% just multiply it by five
Answer:
C
Step-by-step explanation:
if %20 is 290
then %100 is 1450
100:20 is 5
290.5 is 1450
I hope that It's helpful
~best wishes
find the measure of the indicated angle
i'm pretty sure the answer is 52
Step-by-step explanation:
[tex]180 - 110 = 70[/tex]
[tex]180 - 58 - 70 = 52[/tex]
Andre and Noah started tracking their savings at the same time. Andre started with $15 and deposits $5 per week. Noah started with $2.50 and deposits $7.50 per week. The graph of Noah's savings is given and his equation is y=7.5x+2.5, where x represents the number of weeks and y represents his savings.
Write the equation for Andre's savings and graph it alongside Noah's. What does the intersection point mean in this situation?
An equation and the intersection point of the two lines is required.
Andre's equation [tex]y=5x+15[/tex]
The intersection point is [tex](5,40)[/tex]
This means that at 5 months both Andre and Noah will have a total of $40 savings.
Noah's equation
[tex]y=7.5x+2.5[/tex]
x = Number of weeks
y = Savings
Andre's equation
[tex]y=5x+15[/tex]
Let us find two points of each line
[tex]x=0[/tex]
[tex]y=2.5[/tex]
[tex](0,2.5)[/tex]
[tex]y=0[/tex]
[tex]x=-\dfrac{2.5}{7.5}=-0.33[/tex]
[tex](-0.33,0)[/tex]
[tex]x=0[/tex]
[tex]y=15[/tex]
[tex](0,15)[/tex]
[tex]y=0[/tex]
[tex]x=-\dfrac{15}{5}=-3[/tex]
[tex](-3,0)[/tex]
Draw lines through their respective points
The intersection point is [tex](5,40)[/tex]
This means that at 5 months both Andre and Noah will have a total of $40 savings.
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help please i give brainlist crown to whoever answers all correctly
Answer:
a)0
b) 3/4
c)undefined
d)5/3
Step-by-step explanation:
Slope:
y2-x2/y1-x1
so,
line b.
two points: 0,0 and -4,3
3-0/0--4
3/4
line d. points:
0,-1 and 3,3
3--1/3-0
5/3
a is 0 because left to right
c is undefined because up to down.
Hope this helps ;D
Answer:
no
Step-by-step explanation:
Plz help me with this
HELP. i need somebody help. not just anybody help.
srysly tho....help
Answer:
300m meters
Step-by-step explanation:
multiply length value by 1000