5x + 2y = 8
x + y = 4
If you want to solve the system of equations by addition, which of the following could you do?
(A.) Multiply the second equation by 5 and add.
(B.) Multiply the second equation by 2 and add.
(C.) Multiply the second equation by -2 and add.
Answer: C. Multiply the second equation by -2 and add
Step-by-step explanation:
Answer:
Step-by-step explanation:
The solution is C
5x + 2y = 8
-2x -2y= -8
3x = 0
x = 0
2y = 8
y = 4
(0,4)
Evaluate 4x^3 + 2 for x
0.90 divided by 0.30 PLEASE SHOW WORK OR EXPLAIN YOUR REASONING!
A 10-pound weight in a 2-pound weight are dropped from the same height at the same time which weight will hit the ground first
they would drop at the same time
Answer:
explained below
Step-by-step explanation:
when two object one of 10 pound weight and another of 2 pound is dropped from same height
condition 1 : when body fall In vaccum
When body fall in vaccum then there will be no effect of weight.
Both the body will hit the ground at the same time.
Condition 2 : when body falls in normal condition
When body falls in normal condition then in this condition the heavy weight object will fall first as the light weight object will have more air resistance than the heavy one.
If 6 cats can kill 6 rats in 6 minutes, how many cats will it take to kill 100 rats in 50 minutes? previous next
Loretta invested $1000 in a simple interest account yielding 5% paid annually. In 2 years, she will have $1100 in her account. From this example, we can conclude that 5% represents the:
Final answer:
The 5% represents the annual interest rate on Loretta's investment in a simple interest account.
Explanation:
The 5% represents the annual interest rate on Loretta's investment. In simple interest, the interest is calculated as a percentage of the initial investment. So, if Loretta invested $1000, and after 2 years her account has grown to $1100, the interest earned would be $100 (1100 - 1000).
To find the interest rate, we can use the formula:
Interest = Principal * Rate * Time
Using the given information, we can plug in the values and solve for the rate:
100 = 1000 * Rate * 2
Simplifying the equation, we get:
Rate = 100 / (1000 * 2) = 0.05 or 5%
Therefore, the 5% represents the annual interest rate in this scenario.
Find all values of thetaθ, if thetaθ is in the interval [0degrees°, 360degrees°) and has the given function value cot thetaθ=1
for geometric sequence below, determine the explicit formula. be sure to enter your answer as a formula of the form a_n= a_1(r)^(n-1) with the correct a_1 and r values.
5/8, 25/8, 125/8, 625/8, . . ., a_n
Which of the following is an odd function? f(x) = x3 + 5x2 + x mc023-1.jpg f(x) = x2 + x f(x) = –x
By evaluating each function in -x, we will see that the only odd one is:
f(x) = -x
What is an odd function?
We say that a function is odd if:
f(-x) = f(x)
Then we just need to check that for the given functions, let's see what we get:
1) f(-x) = (-x)^3 + 5*(-x)^2 + (-x) = -x^3 + 5x^2 - x ≠ -f(x)
2) f(-x) = (-x)^2 - x= x^2 - x ≠ -f(x)
3) f(-x) = -(-x) = x = -f(x)
So the only odd function is the third one, one useful thing that you may need to know is that usually when you see even exponents, that function will not be odd.
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How to find an equation in slope intercept form given two points?
Group A has an elevation of -282 feet. group B has an elevation of 279 feet. which is closer to sea level
Curt just drank a cup of coffee to help him stay awake. The coffee had 130 milligrams of caffeine in it. If his body processes 7% of the caffeine every hour, how much will be left in 4 hours?
93
94
98
91
Answer:
After 4 hours, there will 91.31 miligrams of caffeine within his body.Step-by-step explanation:
Givens
Curt drank 130 miligrams of caffeine.His body processes 7% of caffeine everyhour.If Curt's body processes 7% every hour, we just need to that 7% after each hour. Also, we know that 7% equals 0.07.
First hour.
[tex]0.07(130)=9.1ml[/tex]
The first hour, his body processed 9.1 miligrams, so it remains
[tex]130-9.1=120.9ml[/tex]
There's still 120.9 miligrams in his body.
Second hour.
[tex]0.07(120.9)=8.46ml[/tex]
[tex]120.9-8.46=112.44ml[/tex]
Third hour.
[tex]0.07(112.44)=7.87ml[/tex]
[tex]112.44-7.81=104.63ml[/tex]
Fourth hout.
[tex]0.07(104.63)=7.32ml[/tex]
[tex]104.63-7.32=97.31ml[/tex]
Therefore, after 4 hours, there will 91.31 miligrams of caffeine within his body.
The perimeter of a rectangle is 42 inches, and its area is 110 square inches. find the length and width of the rectangle.
A diver descends from an elevation of 6 feet below sea level to an elevation
of 98 feet below sea level in 4 equal intervals. What was the diver’s change in
elevation in each interval? Explain how you solved this problem.
Which expression is the factored form of 2/3x+4 ?
A 2/3(x+6)
B 2/3(x+12)
C 2/3(x+4)
D 1/3(2x+6)
Which lines must be parallel if angle 10 is supplementary to angle 11?
The __________ is the score that occurs most frequently in a distribution.
define a variable and write an inequality to model each situation. The school auditorium can seat at most 1200 people.
Find the point-slope form of the equation of the line passing through the points (–1, –3) and (4, 1).
the base of a pyramid has n sides write an expression for the number of faces of the pyramid
Need Answer ASAP!!!!!!!Solve the equation using the zero product property. -n(5n-4)=0
Answer:
[tex]n=0\text{ or }n=\frac{4}{5}[/tex]
Step-by-step explanation:
We have been given an equation [tex]-n(5n-4)=0[/tex]. We are asked to solve our given equation using zero product property.
Zero product property states that the product of two expressions are zero, if and only if, one of them is zero.
Using zero product property, we will set each factor of our equation to zero as:
[tex]-n=0\text{ or }(5n-4)=0[/tex]
[tex]n=0\text{ or }5n-4=0[/tex]
[tex]n=0\text{ or }5n-4+4=0+4[/tex]
[tex]n=0\text{ or }5n=4[/tex]
[tex]n=0\text{ or }\frac{5n}{5}=\frac{4}{5}[/tex]
[tex]n=0\text{ or }n=\frac{4}{5}[/tex]
Therefore, the solutions for our given equation are [tex]n=0\text{ or }n=\frac{4}{5}[/tex].
A segment has an endpoint (14,-8) and (4,12) what are the coordinates of its midpoint
The coordinates of the midpoint of the segment that has endpoints as (14,-8) and (4,12) are (9,2).
What are the coordinates of the midpoint of the line segment AB?Midpoint, as the word suggests, means the point which lies in the middle of something. The midpoint of a line segment means a point which lies in the mid of the given line segment.
Suppose we've two endpoints of a line segment:
A(p,q), and B(m,n)
Then let the midpoint be M(x,y) on that line segment. Then, its coordinates are:
x = (p+m) / 2
and
y = (q+n) / 2
Given that a segment has an endpoint (14,-8) and (4,12). Therefore, The coordinates of the midpoint of the segment can be written as,
X- coordinate = (14+ 4)/2
= 18/2
= 9
Y- coordinate = (-8+12)/2
= 4/2
= 2
Hence, the coordinate of the midpoint of the segment that has endpoints as (14,-8) and (4,12) is (9,2).
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Dustin has only nickels and quarters in his piggy bank. He has 49 coins total for a combined value of $8.85. How many of each does he have
Answer:
Dustin has 17 nickels and 32 quarters.
Explanation:
Let's denote the number of nickels as [tex]\(n\)[/tex] and the number of quarters as [tex]\(q\).[/tex]
We can set up a system of equations based on the given information:
1. The total number of coins: [tex]\(n + q = 49\)[/tex]
2. The total value of the coins: [tex]\(0.05n + 0.25q = 8.85\)[/tex]
We can solve this system of equations to find the values of [tex]\(n\) and \(q\).[/tex]
From equation (1), we can express [tex]\(n\)[/tex] in terms of [tex]\(q\):[/tex]
[tex]\[n = 49 - q\][/tex]
Now, substitute this expression for [tex]\(n\)[/tex] into equation (2):
[tex]\[0.05(49 - q) + 0.25q = 8.85\][/tex]
[tex]\[2.45 - 0.05q + 0.25q = 8.85\][/tex]
Combine like terms:
[tex]\[0.20q + 2.45 = 8.85\][/tex]
Subtract 2.45 from both sides:
[tex]\[0.20q = 6.40\][/tex]
Now, divide both sides by 0.20:
[tex]\[q = \frac{6.40}{0.20} = 32\][/tex]
So, Dustin has 32 quarters.
To find the number of nickels, we can substitute the value of \(q\) into the equation [tex]\(n + q = 49\):[/tex]
[tex]\[n + 32 = 49\][/tex]
[tex]\[n = 49 - 32\][/tex]
[tex]\[n = 17\][/tex]
So, Dustin has 17 nickels.
Whether or not a measurement gives the same results when it is repeated under the same conditions is an indication of the measurement’s _____
If a car travels 23 miles on 1.0 gal of gas, how many liters of gasoline are needed for a 135 mile trip?
Approximately how many times greater is 9.75 * 10^6 than 1.25 * 10^2?
9.75 / 1.25 = 7.8
10^6 - 10^2 = 10^4
= 7.8 x 10^4 greater
Compare 4:10 and 12:20 using fractions. Which ratio is smaller? How do you know?
Answer:
4:10 is smaller because when put into fraction form and making the denominators even, 12:20 comes out to be 6/10
Step-by-step explanation:
At Susie's school, 5/8 of all students play sports. Of the students who play sports, 2/5 play soccer. What fraction of the students in Susie's school play soccer?
Khalid invested $9500 in a savings account with a yearly interest rate of 3% for 8 years. How much simple interest did he earn?
Answer:
$2280
Step-by-step explanation:
|2y+10|=-4 solve for y