Answer:
(1 , 1)
Step-by-step explanation:
x+3y=4
x-2y=-1
We can solve this system of equations using the elimination method. In this method there must be two identical variables ( which in this case there is, that variable being x ). If there are two identical variables you can subtract the two equations "eliminating" one of the variables. There is then only one variable in which you can solve for.
So first let's subtract the two equations
x + 3y = 4
- ( x - 2y = -1 )
------------------
remove parenthesis and apply negative sign
x + 3y = 4
-x + 2y = +1
-----------------
0 + 5y = 5
We are now left with one variable in which we can solve for.
5y = 5
divide both sides by 5
y = 1
Next we want to find the value of x.
To do so we simply plug in the value of y into one of the equations and solve for x. Note that we could do this to either equation and we would get the same answer.
x + 3y = 4
y = 1
x + 3(1) = 4
multiply 3 and 1
x + 3 = 4
subtract 3 from both sides
x = 1
So x = 1 and y = 1
Therefore the solution to the system of equations is (1,1)
12x=3/2 what does x=
_________
[tex] \: [/tex]
[tex]12x = \frac{3}{2} [/tex]
[tex]x = \frac{3}{2} \times \frac{1}{12} [/tex]
[tex]x = \frac{3}{24} [/tex]
[tex]x = \bold{ \frac{1}{8}} [/tex]
Can some one help quickly. Please show work
Answer:
-20
Step-by-step explanation:
48 divided by -3 is -16 but you round up since its high enough and it goes to -20
If you start off with 1220 and you take away 100 then add 50 how much do you have
1220 - 100 = 1120
1120 + 50 = 1170
Answer: 1170
Answer:
1170
Step-by-step explanation:
HI hope you have a wonderful day.
Please complete this for me
According to the graph below how many year from now will the cost of a new computer be closest to the cost of tuition but still higher?
Answer:
its B
Step-by-step explanation:
A greengrocer bought 200 kg of oranges for $180 and sold them for $1.14 per kg. Find
a. His profit.
b. His percentage profit on the cost price.
Answer:
profit : $28
profit percentage: 14%
Step-by-step explanation:
his profit : $1.14 times 200kg = $228
228 -200 = 28
28 divided by 200 = 0.14
0.14 times 10 = 14 %
Kevin is twice as old as his sister Amy their father is five times as old as Amy if the sum of the ages is 64 how old is Amy
Answer:
8 years old
Step-by-step explanation:
Set Amy's age as x.
Kevin's age will be 2x, since he is two times as old as Amy.
Father's age will be 5x, since he is five times as old as Amy.
x + 2x + 5x = Sum of the ages = 64
x + 2x + 5x = 64
Combine like terms: 8x = 64.
Divide 8 on both sides: x = 8.
Amy's age = 8.
Hope this helps!
The bill at the restaurant totaled $45.60. Shawn wants to leave a 15% tip. How much would Shawn leave for a tip
Answer:
$6.84Step-by-step explanation:
[tex]45.60 \times 15\% \\ 45.60 \times \frac{15}{100} \\ \frac{684}{100} \\ 6.84[/tex]
A class has 40 students. The teacher asks how many students in the class have siblings and finds 3/10 of the students have siblings. How many students have siblings?
Answer:
12 students
Step-by-step explanation:
First, find the percentage of how many students have siblings:
3/10 = 0.3 = 30%
40 * 0.3 = 12
This means that 30% of this class are 12 students. These 12 students have siblings.
Hope this helps!
Which expression is equivalent to a + 4a + 8?
05a
13a
a + 12
5a + 8
Answer:
5a +8
Step-by-step explanation:
a+4a=5a
5a+8
=5a+8
Plsssssss helpppppppppp
Which shows a difference of squares?
10 y squared minus 4 x squared
16 y squared minus x squared
8 x squared minus 40 x + 25
64 x squared minus 48 x + 9
Answer:
difference of two squares will be
16y^2 -x^2 = (4y -x)(4y +x)
so the second choice
Step-by-step explanation:
solve pls brainliest
Answer:
1) 0.3%= 3/1000= 0.003
2) 1.32= 132%
Step-by-step explanation:
fdgethryjryj
Answer:
Percent means “out of a hundred“
So 0.3 percent as a decimal can just be you multiplying it by 0.001
Since it’s a hundred percent
You’d get 0.003 as a fraction
For 1.32 into a percentage
Remeber percent means out of a hundred
So in this case its 1.32
1 is a whole number so thats already 100 percent
32 extends to the hundreths place so it becomes 32/100
Now add
100+32 = 132
132%
brainliest and 15 points, pls help very easy
Answer:
70cm
Step-by-step explanation:
1428 rounded to the nearest thousandth
Answer:
1428- one is in the thousandth place
the number beside is lower than five so drop it and add zero to the end
1000 -is now your answer
Step-by-step explanation:
hope this helps if not then sorry goodluck and bye
The number 1428 to the nearest thousand is 1000.
When you round a number to a certain digit, you have to check the value of the digit before the place you want to round off to.
1. If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up.
2. If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down.
Here, the question said the nearest thousand, so I had to look at the value in the hundred places which is 4 and less than 5.
Hence round the number down.
So, 1428 to the nearest thousand is 1000.
To learn more about rounding numbers visit:
brainly.com/question/27207159
#SPJ3
9. Gabriel is solving 23 x 12. He already multiplied the ones, 2 x 3 = 6. What two digits should he multiply next? How do you know these
are the digits he should multiply?
Help plz
Answer:
20 x 10
Step-by-step explanation:
because these are the remaining digits :D
The label on a 1 1/4 gallon can of paint states that it will cover an area of 425 square feet.
Answer:
There is no question, but I'll assume that if there is one, the useful conversion factor will be one tah expresses paint coverage in gallons/ft^2.
0.050 gallon/ft^2
Step-by-step explanation:
1 1/4 gallon covers 425 ft^2
(1 1/4 gallon)/(425 ft^2)
0.050 gallon/ft^2
Solve please? I don't understand this please help
Answer: 8
Step-by-step explanation: Found the ratio of 6/12, which is 1/2, so I used ?/16, plugged it in.
what is the answer to 1/2 + 1/3 =
Answer:
5/6 (decimal form: 0.83)
Step-by-step explanation:
Answer: 0.8333… (numbers keep going)
Step-by-step explanation:
HW 6.7 #11
Find the half-life of an element which decays by 3.418% each day. Hint: use y = ab^t.
First setup the equation for how much element is remaining after each day:
y = a ( 100% - 3.418%)^t
where y is the amount remainig and t is the number of days
We can clean this up by subtracting the percentages and converting that to a decimal:
y = a (0.96582)^t
Now for the half-life, we need to figure out how long until there's half of what we started with. When does "a (0.96582)^t" equal "1/2 of a"
1/2a = a (0.96582)^t
divide by a on both sides and you get
1/2 = (0.96582)^t
take the log of both sides and you get:
log(1/2) = t log(0.96582)
divide both sides by log(0.96582)
log(1/2) / log(0.96582) = t
Throw that into a calculator and you have
t ≈ 19.93
Order these numbers from least to greatest.
Answer:
5 8/11, 57/10, 5.724, 5.95
Step-by-step explanation:
Tolong bantuannya kak, butuh bangett..klo ga bisa jangan asal plss
Answer:
i dunno what you saying i think we were in the other country ?_?
Manuela claims that ab and pq are congruent
ohmygod help
10, 10, 18, 18, 10, 5, 12, 13
Find the median and mean number of hours for these students.
If necessary, round your answers to the nearest tenth.
Step-by-step explanation:
The mean (average) of a data set is found by adding all numbers in the data set and then dividing by the number of values in the set.
The median is the middle value when a data set is ordered from least to greatest.
If there is an even number of items in the data set, then the median is found by taking the mean (average) of the two middlemost numbers.
so, the mean value is
(10+10+18+18+10+5+12+13)/8 = 96/8 = 12
the median is first not clear when ordering the data set, as we have an even number of elements.
5 10 10 10 12 13 18 18
so, we have to take the mean or average between the 2 middle numbers : 10 and 12.
(10+12)/2 = 22/2 = 11
the median is 11.
What is the value of y=3x−1 when x=4?
Answer:
11
Step-by-step explanation:
y=(3 x 4)-1
y=12-1
y=11
Answer:
y = 11
Step-by-step explanation:
Substitute the value for x.
[tex]y=3x-1\\y=3(4)-1\\y=12-1\\y=11[/tex]
Solve for y.
2- -3 = y
y =
Answer:
y=5
Step-by-step explanation:
the way you do this is by adding 2 and 3 because two negatives make a positive.
add xy+ 5yz - 2xz, 4yz + 3xy +5xz, xz +2xy + 3yz
Please help me im not sure how to do this. My teacher makes us learn by reading a book and im not understanding the book
We have 5 ft 9 in = 69 in, so
P(X > 69) = P((X - 64.1)/2.5 > (69 - 64.1)/2.5) = P(Z > 1.96)
where X and Z both represent women's heights, but Z is normally distributed with mean 0 and s.d. 1.
Then consulting a table of z-scores, you'll find that P(Z > 1.96) ≈ 0.025. So approximately 2.5% of women are taker than 5'9''.
If you have 12 green marbles, 22 white marbles, 12 purple marbles, and 4 blue marbles what is the probability of getting a green marble
12 + 22 + 12 + 4 = 50
There are 50 marbles you can choose from and 12 green marbles so the chance of you getting a green marble is:
12/50
= 0.24
24%
What is $2.5 as a percentage of 20 dollars
Answer:
0.5
Step-by-step explanation:
That's the answer cheif
Answer:
12.5%
Step-by-step explanation:
I did 20/2.5, and got 8. That means there are 8 groups of 2.5 inside 20.
Then, I did 100/8 to represent the percentage.
I got 12.5%.
