Answer:
(-6,-5)
Step-by-step explanation:
X+y=-11
solve for x
x=-11-y
substiute x value into 2nd equation
2x-3y=3
2(-11-y)-3y=3
-22-2y-3y=3
-5y=25
y=-5
substitute -5 for y in either equation to find x
x+y=-11
x+-5=-11
x=-6
2. A chemist has a 25% and a 50% acid solution. How
much should be used to form 250 mL of a 35% acid
solution?
A) 80 mL of 50% solutions and 120 mL of 25% solution
B) 150 mL of 50% solution and 50 mL of 25% solution
© 60 ml of 50% solution and 140 mL of 25% solution
D) 50 mL of 50% solution and 150 mL of 25% solution
E) None of the above
Answer:
x is mL of 25% acid and y is mL of 50% acid
We set up 2 equations:
A) x + y = 250
B) .25 x + .50y = .35 * 250 which equals
B) .25x + .50y = 87.50 Multiplying A) by -.5
A) -.5x -.5y = -125 adding the equations we get
-.25x = -37.50
x = 150 mL
y = 100 mL
Source: http://www.1728.org/mixture.htm
Step-by-step explanation:
Answer:
x is mL of 25% acid and y is mL of 50% acid
Step-by-step explanation:
Moe painted the lid of the barrel. The circumference of the barrel is 32*3.14 inches. What is the area of the lid in square inches?
Answer: 803.84 inch²
Step-by-step explanation:
The lid will take the appearance of a circle so the area of the lid is the same as the area of a circle:
Area of a circle = π * radius²
The circumference of a circle is:
= π * diameter
Looking at the above, the diameter is 32inches because this is the figure to be multiplied with π = 3.14 to find the circumference.
Since diameter is 32, radius will be:
= 32 / 2
= 16 inches
Area = 3.14 * 16 * 16
= 803.84 inch²
Help me out! I'm begging
Answer:
B
Step-by-step explanation:
A meal that costs $20 has a sales tax of $1.90. What's the sales tax on a meal that costs $75?
PLEASE HELP AND I WILL GIVE U A CHOCOLATE
Answer:
B is the answer
Step-by-step explanation:
(√(1.5³ * 1.5⁷))/1.5²
√ 1.5 ^(3+7) ÷ 1.5²
√1.5^10 ÷ 1.5²
1.5⁵ ÷ 1.5²
1.5^(5-2)
1.5³
Answer:
I think it is c I hope it helps have a good day
True or False:
x2 and -2x2 are like terms
Answer:
true i think....
Step-by-step explanation:
like terms have the same variables but don't need to have the same coefficients.
In algebra, like terms are terms that have the same variables and powers. The coefficients do not need to match. Unlike terms are two or more terms that are not like terms, i.e. they do not have the same variables or powers.
(6.8 X10)–(7.2 X 10)
1.1 X 104
X 10
Go to two decimal places
Answer:
5.53 * 10^-1
Step-by-step explanation:
[(6.8 * 10^3) - (7.2 * 10^2)] ÷ 1.1 * 10^4
(6800 - 720) ÷ 11000
6080 ÷ 11000
6.08 * 10^3 ÷ 1.1 * 10^4
(6.08 ÷ 1.1) * 10^3-4
5.527 * 10^-1
= 5.53 * 10^-1
answer this question for 25 points and brainliestt
Answer:
-10, square root of 100, square rout of 220, 11.5
Step-by-step explanation:
You have three sticks. Each stick has one red side and one blue side. You throw the sticks 10 times and record the results. Use the table to find the experimental probability of the event.
Answer:
4 + 4 + 2 = 10
3) 3/10 or 0.3
4) 2/10 = 1/5 or 0.2
5) 4/10 = 2/5 or 0.4
6) 2 + 4 + 0 = 6 so 6/10 = 3/5 or 0.6
i think its this. i hop i helped?
Step-by-step explanation:
how much does an x box emulator cost and what does it do??? Will give brainliest to first right answer!!!
Answer:
113.44
Step-by-step explanation:
It can emulate the BIOS and many games at very slow speeds but is sometimes faster than Cxbx with acceptable graphics
What is the equivalent exponential expression for the radical expression below help last time
Answer:
A
Step-by-step explanation:
B is wrong because 5^2 = 25
C is wrong because 5 is not equal to √5
D is wrong because 25 is not √5 but 5^2
ILL BRAINLIEST YOU IF YOU GET IT RIGHT
please explanation
Answer:
I thinks
Step-by-step explanation:
Which equation is y = (x + 3)2 + (x + 4)2 rewritten in vertex form?
y = 2 (x + seven-halves) squared minus one-fourth
y = 2 (x + seven-halves) squared minus one-half
y = 2(x + 7)2 – 73
y = (x + 7)2 – 24
Answer:
The person above is correct B)y=2(x+7/2)²+1/2
Step-by-step explanation:
y = 2 (x + seven-halves) squared plus one-fourth equation is y = (x + 3)² + (x + 4)² rewritten in vertex form.
What is vertex form?If the vertex is (a, b), then the vertex form of an equation can be written as y = p(x-a)² + b, p is a constant.
How to solve this problem?Here, y = (x + 3)² + (x + 4)²
i.e. y = x² + 6x + 9 + x² + 8x + 16
i.e. y = 2x² + 14x + 25
i.e. y = 2x² + 2*2*(7/2)x + (7/2)² - (7/2)² + 25
i.e. y = 2(x + 7/2)² + 25/2 - 49/4
i.e. y = 2(x + 7/2)² + (50 - 49)/4
i.e. y = 2(x + 7/2)² + 1/4
Therefore, y = 2 (x + seven-halves) squared plus one-fourth equation is y = (x + 3)² + (x + 4)² rewritten in vertex form.
So, no option is correct.
Learn more about vertex form here -
https://brainly.com/question/27614899
#SPJ2
1) Herman made 2 bowls of fruit salad. He used 7 kilograms of melon in all. How many kilograms
of melon, on average, were in each bowl?
10 m =_____ mm hurry pls .
Answer:
10,000 mm
Hope that helps!
Step-by-step explanation:
Answer:
10000 mm
Step-by-step explanation:
1m = 1000mm
10 x 1000 = 10000mm
Name this figure.
A. Trapezoid
B. Rhombus
C. Rectangle
D. Parallelogram
HELP NOW PLEASE !!!!
Answer:
The figure is a Rhombus.
Step-by-step explanation:
Cause well it looks like a Diamond pretty much. Hope this helps.
Answer:
Parallelogram.
Step-by-step explanation:
This is a rhombus but all rhombus's are considered parallelograms.
Hope this helps!
Reagan will use a random number generator 1,200 times. Each result will be a digit from 1 to 6 . Which statement best predicts how many times the digit 5 will appear among the 1,200 results?
Answer:
i think its b
Step-by-step explanation:
Hope it helps have a great day :)
exercise 8
Let x be a positive integer.
Gas is priced at $2.70 per gallon. My gas tank has 2 gallons currently in the tank. Write an equation to show much
money I will spend to fill up my tank.
Answer:
The equation is
2.7x - 5.4
Step-by-step explanation:
Gas is priced at $2.70 per gallon. My gas tank has 2 gallons currently in the tank. Write an equation to how much
the money I will spend to fill up my tank.
Let the total gallons that would fill your tank = x
The tank currently has 2 gallons
A gallon =>$2.70
Therefore, our equation is
=(x - 2) × 2.70
= 2.7x - 5.4
Please help 10 points
Answer:
i think a
Step-by-step explanation:
Help me please I’ll give extra points
What is the solution to the system of equations?
(-6,4)
(-5, 4)
(-3, -2)
(0, 1)
Answer:
(0,1) is the answer
Step-by-step explanation:
hope it helped!!!
Some body help me with this pleaseeeee
Answer:
16 4/5
Step-by-step explanation:
1. Divide 5 3/5 by 2 (2 4/5)
2. Multiply 2 4/5 by 2 and multiply 5 3/5 by 2 (5 3/5) (11 1/5)
3. Add them together (16 4/5)
hurry pls i'm giving away 22 point because i only have 35
Answer:
the median is the middle. you line all the numbers up from lowest to highest, and the middle number is the median
32, 37, 38, 40, 50, 52, 55, 57
45 is the answer. the midle is 40, and 50, and 45 is right in the middle of those numbers
A tire on Tom's car weighs 21 2/3 pounds. All 4 tires have the same weight. Which is the total weight of the 4 tires on Tom's car?
Answer:
86.6666666667
Step-by-step explanation:
Because one of Tom's car wheel weighs 21 2/3 pounds, you would have to multiply 21 2/3 pounds by 4 to get the amount of pounds that all the tires weigh; which makes the answer:86.6666666667
Answer:
86 2/3
Step-by-step explanation:
you multiply 21 × 4 and get 84
multiply 2 × 4 and get 8
Divide 8/3 and get 2 2/3
add 2 to 84
and leave the 2/3
What is 11/12 + 2 1/6 ?
Either decimal or fraction.
Answer:
3.0833
Step-by-step explanation:
i dont know how many 3's
Answer: 37/12
Step-by-step explanation: First you must turn 2 1/6 into a improper fraction, so 2x6 + 1 will get you 13 as the numerator and the denominator will be 6 so now we have 13/6 + 11/12. Now we must turn the denominator for 13/6 into 12 so, 13x2/6x2 so it is 26/12 so now the equation is 26/12 + 11/12 is 37/12.
17. There are 1,024 players in a tennis tournament. In each round, half the players are eliminated.
Which function can be used to find the number of players remaining in the tournament at the end of
x rounds?
A f(x) = 1,024(1.50)
B f(x) = 1,024(0.50)*
C f(x) = 1,024(1.05)
D f(x) = 1,024(0.50)x
Answer?
Answer:
1024(0.50)^x
Step-by-step explanation:
Initial value = 1024
Players eliminated per round =half = 50% of players in the round
Using the relation :
A(x) = P(1 - r)^x (decreasing hence, negative)
A(x) = 1024(1 - 50%) ^x
A(x) = 1024(1 - 0.50)^x
A(x) = 1024(0.50)^x
In a sample of students, 12 out of 24 students in a class wanted a sandwich for lunch. Using the data from the sample, predict how many students would want sandwiches for lunch in a school of 400.
A 200
B 250
C 300
D 100
Answer:
200
Step-by-step explanation:
good luck :)
please help i really need it
Answer:
b
Step-by-step explanation:
i did that one in class it was right.
the best answer ill give Brainliest i may give it to more than one
Answer:
a) y = -2/5x + 3 b) (20, 19)
Step-by-step explanation:
a) slope of PQ => 24-9/22-16 = 15/6 = 5/2
perpendicular line have negative reciprocal slope = -2/5
substitute the new slope -2/5(m) and (5, 1) into the equation: y = mx + c to find the value of c
=> 1 = -2/5(5) + c
=> c = 3
plug in both the slope -2/5(m) and b = 3 into the equation: y = mx + c
=> y = -2/5x + 3
b) (2/3(22 -16), 2/3(24 - 9))=> (4, 10)
(16, 9) + (4, 10) = (20, 19)
