Graph y = -3x + 7.
2
Answers
Answer:
I love math anyways
The ans is in the picture
(hope this helps can i plz have brainlist :D hehe)
Step-by-step explanation:
Related Questions
The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.3 hours. If 1 gram of this isotope is present initially, how long will it take for 90% of the lead to decay? (Round your answer to two decimal places.)
Answers
Answer:
It will take 10.96 hours for 90% of the lead to decay.
Step-by-step explanation:
The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t
This means that the amount can be modeled by the following function:
[tex]A(t) = A(0)e^{-rt}[/tex]
In which A(0) is the initial amount and r is the decay rate.
Has a half-life of 3.3 hours.
This means that [tex]A(3.3) = 0.5A(0)[/tex]. We use this to find r.
[tex]A(t) = A(0)e^{-rt}[/tex]
[tex]0.5A(0) = A(0)e^{-3.3r}[/tex]
[tex]e^{-3.3r} = 0.5[/tex]
[tex]\ln{e^{-3.3r}} = \ln{0.5}[/tex]
[tex]-3.3r = \ln{0.5}[/tex]
[tex]r = - \frac{\ln{0.5}}{3.3}[/tex]
[tex]r = 0.21[/tex]
So
[tex]A(t) = A(0)e^{-0.21t}[/tex]
How long will it take for 90% of the lead to decay?
This is t for which [tex]A(t) = 0.1A(0)[/tex], that is, 100 - 90 = 10% of the initial amount.
[tex]A(t) = A(0)e^{-rt}[/tex]
[tex]0.1A(0) = A(0)e^{-0.21t}[/tex]
[tex]e^{-0.21t} = 0.1[/tex]
[tex]\ln{e^{-0.21t}} = \ln{0.1}[/tex]
[tex]-0.21t = \ln{0.1}[/tex]
[tex]t = -\frac{\ln{0.1}}{0.21}[/tex]
[tex]t = 10.96[/tex]
It will take 10.96 hours for 90% of the lead to decay.
Joey pays $35.85 each month for his new stereo what does he pay each year
Answers
$430.20
STEP BY STEP
there are 12 months in a year so multiply that number by 12.
Hope this helps
Answer:
$430.20
Step-by-step explanation:
35.85 x 12= 430.20
You are given the following equation: (x+3)^2 + (y+9)^2 = 144 What is the
(h,k)
Answers
Answer:
Step-by-step explanation:
Equation of circle: (x - h)² + (y -k)² = r²
(x+ 3)² + (y + 9)² = 144
(x+ 3)² + (y + 9)² = 12²
h = -3 ; k = -9
there are 960 pages in a book. each page contains 25lines. how many lines are there in the book
Answers
Answer:
24000 Lines.
Step-by-step explanation:
960x25=24000
Answer:
24,000
Step-by-step explanation:
just multiply 960 x 25
If f(x)=47x-55, then f(f^-1(x))=?
Answers
Randy bought 3 identical shirts and paid a sales tax of $2.84. The total cost was $50.18. What was the cost of each shirt?
Answers
Answer:
$15.78
Step-by-step explanation:
I) Remove tax:
$50.18 - $2.84 = $47.34
II) Construct an equation to find the cost of each shirt:
47.34 = 3s
III) Solve:
Divide each side by 3:
15.78 = s
Each shirt costed $15.78
Answer:
15.78
Step-by-step explanation:
Order of operations with integers
Calculate: 8-4(2+5²)/12
Answers
Answer:
Step-by-step explanation:
8-4(2+ (5)2) /12
8-4 (2+25)/12
8-4 (27)/12
4(27) /12
108/12
= 9
Help me please if you can
Answers
Answer:
<D=<J
Step-by-step explanation:
The first answer is the only correct statement. In geometry, congruent angles are shown through the number of arcs on the vertex of an angle. For example, if two different angles both had three arcs on the vertex, then those two angles are congruent. In this figure, both <D and <J have 4 arcs, which means they are congruent. Additionally, both angles are opposite of a line that measures 25 inches. If two angles are opposite of congruent lines, then the angles are also congruent.
A carpenter leans a 20-foot ladder against a building so that an angle of 60° is formed between the ladder and the ground. How many feet away from the
building is the bottom of the ladder?
O 10/3ft
O 20 ft
O 20V2 ft
O 10 ft
Answers
Answer:
The foot of the ladder is
10
feet away from the base of the wall.
Step-by-step explanation:
The distance between building and the bottom of the ladder is option (D) 10 ft
What is Trigonometric function?In mathematics, the trigonometric functions are real functions which relate an angle of a right-angled triangle to ratios of two side lengths.
Given,
Length of the ladder = 20 foot
Angle between the ladder and the ground = 60 degrees
Draw the figure using the given data
We know,
cos θ = Adjacent side / Hypotenuse
cos 60 = [tex]\frac{x}{20}[/tex]
x = 20 × cos 60
x = 10 ft
Hence, the distance between building and the bottom of the ladder is option (D) 10 ft
Learn more about Trigonometric function here
https://brainly.com/question/6904750
#SPJ2
AM I RIGHT PLEASE HELP will mark BRAINLIEST
Answers
Answer:
Yes
Step-by-step explanation:
BC ll EF
Need help please only searious answers.
Answers
Answer:
answer 3
Step-by-step explanation:
Hope this helps you out
The highest degree of academic achievement in the American education system is a __________ degree.
A.
bachelor’s
B.
doctorate
C.
master’s
D.
secondary
Answers
Explanation: takes the most time to get
You are saving up money to buy a new ipad. You begin with $25, and are able to save $40 each month. Write an
equation to determine the amount of money you have after x months.
Pleaseee help me!!! Needed by 10:35
Answers
Answer:
567
Step-by-step explanation:
PLS HELP with this problem !!!
Answers
Answer:
god
Step-by-step explanation:
Solve: 8p = 24
A p = 192
B p = 16
p=3
D p = 32
Answers
Answer:
p=3
Step-by-step explanation:
Step-by-step explanation:
8p = 24
p=3
HOPE it helps you ..
It’s due late tonight can some pls help me pass
Answers
Answer:
Table A
Step-by-step explanation:
plugging the x values into the rule f(x)=-2x gets you
f(-3)= 6
f(-1)= 2
f(1)= -2
f(3)= -6
Help please my teacher wont let me leave till im done with this question
Answers
Answer:
To find the x intercept substitute 0 for y and solve for x. To find the y intercept substitute 0 for x and solve for y.
X intercept: (-2,0)
Y intercept: (0,5/2)
im not sure if you looking for the X and Y intercept for the second equation but if you are the
X intercept: (5/2,0)
Y intercept: (0,-5)
Answer:
hey vanessa its me caden....
Step-by-step explanation:
(sorry i cant help with the problem....)
Rewrite -8x-2y=6 into slope intercept
Answers
Looking out for me balcony the angle of elevation to the top of the next building is approximately 22° in the English depression to the bottom of the building approximately 29° if the building is 200 feet away how tall is the building?
I will give brainliest to whoever solves it right. hint its not 80.7 feet
Answers
Answer:
Step-by-step explanation:
[tex]\tan22=h_1/200,\ \tan29=h_2/200
h_2+h_1=200(\tan29+\tan22)
H\approx 191.667ft
H\approx 191’ 8”
The Question is in the attachment below
Answers
Answer:
Step-by-step explanation:
It is J I’m pretty sure
Pls help me I will give brainliest
Answers
Answer:
Step-by-step explanation:
a^8/c
Answer:
a8
b
10
/c
a^8/c
Step-by-step explanation:
Can I pls get the Brainlist
Find the sum to 40 terms of the arithmetic sequence below. Please show your
work.
14+23+32
Answers
Answer:
7580
Step-by-step explanation:
The formula for the sum of an arithmatic sequence is
[tex]\frac{n}{2} (a_{1} + a_{n})[/tex],
where n = total number of terms (in this case 40)
[tex]a_{1}[/tex]= the first term (in this case 14)
and [tex]a_{2}[/tex] = the last term (we will need to find this)
to find the last term, we can use this formula:
[tex]a_{n} = a_{1} + (n-1)d[/tex]
where d is the difference between each term (in this case 9, because 23 - 14 = 9, and 32 - 23 = 9)
thus, [tex]a_{n}[/tex] = 14 + (40 - 1)9 = 14 + 39*9 = 14 + 351 = 365
plug this back into the first formula to get
Σ = [tex]\frac{40}{2}[/tex] (14 + 365) = 20(379) = 7580
Answer The Question for Brainliest
Answers
Answer:
turn it 90 degrees, hope this helps
Step-by-step explanation:
Answer:
so go to the 120 degree line and make sure the line is straight across from zero and thin dray a line going from 120 down to the bottom of where the zero is
Step-by-step explanation:
X-3y=15 and y=-3x+4 determine if the lines are parallel,perpendicular,or neither
Answers
Answer:
neither parallel or perpendicular.
Step-by-step explanation:
Answer:
3 x + y = 16
Step-by-step explanation:
What's the slope of the line in the graph above?
Question 9 options:
A)
–3∕5
B)
–5∕3
C)
5∕3
D)
3∕5
Answers
Answer:
C.5/3
Step-by-step explanation:
5 up and 3 to the side
Answer:
C is correct
Step-by-step explanation:
A helicopter is planning a route in a straight line from the top of Mount Whitney to Death Valley. (These two locations are in California and are the highest and lowest points respectively in the continental United States. They are only about 85 miles apart.) The helicopter will start at the top of Mount Whitney at an elevation of 14,505 feet and fly to the Badwater Basin (282 feet BELOW sea level). During its flight, the helicopter descends at a rate of 493 feet per minute, and the trip will take about 30 minutes.
Write an equation that relates the helicopter's elevation (E) to the travel time (t).
Question 3 options:
E=−493t+14787
t=14505−493E
E=14505−493t
E=282+14505t
Answers
The linear function that relates the helicopter's elevation (E) to the travel time (t) is:
E = −493t+14787What is a linear function?A linear function is modeled by:
[tex]y = mx + b[/tex]
In which:
m is the slope, which is the rate of change, that is, by how much y changes when x changes by 1.b is the y-intercept, which is the value of y when x = 0.In this problem:
The helicopter descends at a rate of 493 feet per minute, hence [tex]m = -493[/tex].It flies from an elevation of 14,505 feet to an elevation of 282 feet BELOW sea level, hence the distance it travels in feet is [tex]b = 14505 + 282 = 14787[/tex]Hence, the model is:
E=−493t+14787You can learn more about linear functions at https://brainly.com/question/13967935
Answer:
E=−493t+14787
Step-by-step explanation:
just got it right on the test
Blake bought a new set of golf clubs. He found them at Golf Pro for $270. If the store is offering 20% off how much are the new clubs?
Answers
Answer:
216
Step-by-step explanation: 270-20%= 216
Find three consecutive integers such that that product of the first and third is one
less than 22 times the second integer.
Answers
Answer:
n = the first
n + 1 = the 2nd
n + 2 = the 3rd
n(n + 2) - (n + 1) = 10(n + 2) + 1
n2 + 2n - n - 1 = 10n + 20 + 1
n2 - 9n - 22 = 0
(n - 11)(n + 2) = 0
If two factors = 0, at least one must = 0.
n - 11 = 0
n = 11
11,12,13
n + 2 = 0
n = -2
-2,-1,0
A park ranger wants to know the average time it takes hikers to hike a trail. There is an average of 1,245 hikers on the trail in a year. How can he find a reasonable estimate for the amount of time it takes to hike the trail? A time any hiker on the trail and use that time
B time himself on the trail and use that time
C time 100 hikers and average their times
D time 3 hikers and average their times
Answers
Answer:
B
Step-by-step explanation:
the reason why is a bigger sample size and a different types of people in a 100 than 3 or than himself
AHH IM SORRY!!Twenty-four out of forty pies at the bake sale are chocolate pies. What percent is chocolate.
Answers
24%
40%
60%
75%
Ik I should be figuring it out on my own but my brain is fried
Answers
Answer:
60%
Step-by-step explanation: