Four more than twice a number x is 12. Write an equation that represents this situation. Determine the number x
Answers
Answer:
2x+4=12
x=4
Step-by-step explanation:
Let's look at the way that this question is written in order to write the equation
"Four more than" this means that we need to add 4 to the next thing that is listed.
"Twice a number x" means 2x
Combining the last two gives us 2x+4
"Is 12" means =12
Combining everything gives us
2x+4=12
Now we can solve for x
Related Questions
Victoria jogged a total distance of 4 1/3 miles during the months of June and July. If Victoria jogged only 1/6 of a mile everyday, which expression shows the number of days in which she went jogging?A) 4 1/3 x 6 = ?B) 4 1/3 / 6 =?C) 4 1/3 + 6 =?D) 4 1/3 - 6 =?
Please help anyone please?
5x+2+6x+9=10x+5 solve the equation.
I WILL GIVE 20 POINTS FOR FIRST TWO ANSWERS PLUS AN ADDITIONAL FIVE FOR BEST COME TO MY PAGE FOR MORE INFO P.S ANSWER BOTH! Maria determined that the length of her driveway from the main road is 35.25 meters.Which number sentence will tell how long Maria’s driveway is, measured in kilometers?A.35.25 × 100B.35.25 ÷ 1,000C.35.25 ÷ 100D.35.25 × 1,000The mass of a large adult male hippo is about 1,850,000 grams and the mass of a large adult female is about 1,525,000 grams.What is the difference, in kilograms, between the masses of the adult male and female hippos?
Answers
20 chaperones are needed
The answer is 20.
120 / 12 = 10
This means that there are 10 sets of 12 students. Now multiply 10 by 2:
10 * 2 = 20
Good luck!
19
20
21
Answers
3x+3=57
3x=54
x= 54/3
x= 18
x+1= 19
x+2= 20
Therefore 20 is the largest
Answer:
20
Step-by-step explanation:
just took the test
Solve x + x + 2 + 2x = -2.
1
-1
0
-2
Answers
Answer:
The answer is b: -1
Step-by-step explanation:
x + x + 2 + 2x = -2
Collect like terms
x + x + 2x = -2 - 2
4x = -4
Divide both sides by 4
x = -4/4
x = -1
Answer:
as follows
Step-by-step explanation:
Answers
Here's the equation for the area of a semicircle: A = (πr²)/2
Based on this, let's solve for this area in terms of π (pi):
A = π(10²)/2 = 100π/2 = 50π
The area of the semicircle, I believe, is 50π. Hope this helps, let me know if I messed up!
Answer: A=157
Step-by-step explanation: The area of a semi-circle can be found using the radius in the formula A=1/2r^2. We substitute the radius in the equation A=1/2*3.14*10^2
First we do the exponents following pemdas.
A=1/2*3.14*10^2
A=1/2*3.14*100
Then we multiply.
A=1/2*3.14*100
A=1.57*100
A=157
The final answer is 157.
Hope this helps!
Answers
1+2=3
3+4=7
7•3=21
There is an invisible multiplication sign between the two parentheses :).
2.y=4x^3+3x^2+2
3.y=2x+3+8/x
4.y=x^3-9x^2-21x+11
5.y=9x^2/3-2x+5
Please provide full working out, thanks.
Answers
y=x²+2x
we have to calculate the first derived
y´=2x+2
we equal to "0" the first derived and find out the value of "X"
2x+2=0
x=-2/2=-1
we have to calculate de second derived
y´´=2>0 ⇒we have a minimun at x=-1
we calculate y
y=(-1)²+2(-1)=1-2=-1
Answer: we have a minimum at (-1,-1)
2)
y=4x³+3x²+2
we have to calculate the first derived
y´=12x²+6x
we equalize to "0" the first derived and find out the value of "X"
12x²+6x=0
6x(2x+1)=0
6x=0 ⇒x=0
2x+1=0 ⇒x=-1/2
we have to calculate de second derived
y´´=24x+6
y``(0)=24(0)+6=6 >0 ⇒we have a minimun at x=0
y``(-1/2)=24(-1/2)+6=-12+6=-6 ⇒we have a maximum at x=-1/2
we calculate y
if x=0, y=2
if x=-1/2; y=4(-1/2)³+3(-1/2)²+2=9/4.
we have to equalize the second derived to "0" and find out the value of "x"
24x+6=0
x=-6/24=-1/4; in x=-1/4 we have an inflection point.
y=4(-1/4)³+3(-1/4)²+2=31/16
Answer: we have a minimum at (0,2), a maximum at (-1/2, 9/4) and a inflection point at (-1/4, 31/16).
3.
y=2x+3+8/x
y=(2x²+3x+8)/ x
we have to calculate the first derived
y´= [(4x+3)x-(2x²+3x+8)] / x²=(4x²+3x-2x²-3x-8) / x²=(2x²-8)/x²
we equal to "0" the first derived and find out the value of "X"
(2x²-8) / x²=0
2x²-8=0
x=⁺₋2
we have to calculate de second derived
y´´=[(4x)x²-2x(2x²-8)] / x⁴=(4x³-4x³+16x)/x⁴)=16/x³
y``(-2)=16/(-2)³=-2>0 ⇒ at x=-2 exist a maximum
y´´(2)=16/(2)³=2<0 ⇒ at x=2 exist a minimum
we calculate y
y(-2)=-4+3-4=-5
y(2)=4+3+4=11
Answer: we have a maximum at (-2,-5 ) and a minimun at (2,11)
4)
y=x³-9x²-21x+11
we have to calculate the first derived
y´=3x²-18x-21
we equal to "0" the first derived and find out the value of "X"
3x²-18x-21=0
x²-6x-7=0
x=[6⁺₋√(36+28)]/2=(6⁺₋8)/2
x₁=-1
x₂=7
we have to calculate de second derived
y´´=6x-18
y``(-1)=-6-18=-24<0 ⇒at x=-1 exist a maximum
y´´(7)=42-18=24>0 ⇒ at x=7 exist a minimum.
we calculate y
y(-1)=-1-9+21+11=22
y(7)=343-441-147+11=-234
We equalize the second derive to 0, and find out the value of "x"
6x-18=0
x=3 in x=3 exist an inflection point
y=27-81-63+11=-106
Answer: we have a minimum at (7,-234), a maximum at (-1,22) and an inflection point at (3,-106).
5)
y=9x²/³-2x+5
we have to calculate the first derived
y´=6x⁻¹/³-2
we equal to "0" the first derived and find out the value of "X"
6x⁻¹/³-2=0
x⁻¹/³=1/3
x¹/³=3
x=27
we have to calculate de second derived
y´´=-2x^(-4/3)
y´´(27)=-0.024<0 ⇒ at x=27 exist a maximum
we calculate y
y=32
Answer: we have a maximum at (27,32)