Answer:
is this adding?
Step-by-step explanation:
please let me know
Element X is a radioactive isotope such that every 20 years, its mass
decreases by half. Given that the initial mass of a sample of Element X is 410
grams, how long would it be until the mass of the sample reached 270 grams,
to the nearest tenth of a year?
Answer:
12.1
Step-by-step explanation:
y=a(1/2)^t/h
270=410(1/2)^t/20
Divide both sides by 410
0.6585365854 = (1/2)^t/20
Log Both sides
Log(0.6585365854) / Log(1/2)
.6026645024= t/20
20 x .6026645024 = t
12.05329005 to the nearest tenth is 12.1 = t
3x + 9 = -45 step by step please
Answer:
x=- 18
Step-by-step explanation:
3x+9= -45
3x=-45-9
3x=-54
x=-54/3
x= -18
What is the equation of the line through (4, -3) and (0, -2)?
A. y = 4x + 2
B. y=-4x - 2
C. y = -12- 2
D .y= 4x + 2
Helppppppppp please
Answer:
-4 > -6
Step-by-step explanation:
-4 is greater than -6. If you plot it on a number line, remember that numbers to the right of another number are greater. BRAINLIEST Please?
Brainliest to whoever is correct!
The correct product for the problem below.
[tex](- \frac{8}{5}) (\frac{2}{3}) (-4)[/tex]
A) -64/15
B) 64/15
C) 16/60
D) -16/60
E) 64/60
Answer:
[tex]\huge\boxed{\sf \frac{64}{15} }[/tex]
Step-by-step explanation:
[tex]\sf (-\frac{8}{5} )(\frac{2}{3})(-4)\\\\= \frac{(-8)(2)(-4)}{5*3} \\\\= \frac{64}{15} \\\\\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807On a map from Dallas, TX to Tyler, TX the measurement is 4.5 inches. Suppose the
scale is 1 inch = 25 miles. What is the actual distance?
Answer:
Step-by-step explanation:
25 × 4.5= 112.5 and that is you answer
An item had an original price of $5.00. It had a percent markup of 45%. What was the value of the markup?
Answer:
markup price = $2.25
Step-by-step explanation:
markup = 45% of $5
markup = 45/100 x 5
markup = $2.25
selling price = $5 + $2.25
selling price = $ 7.25
Answer:
$2.25
Step-by-step explanation:
edgems 2020-2021
I give Brainlliest! 15 pionts!
Write the decimal as a percent.
0.768 =
Answer:
76.8%
Step-by-step explanation:
All you have to do is multiply the decimal by 100.
Answer:
76.8%
Step-by-step explanation:
I just did a thing and got the answer -v-
In the given figure, ABCD is a trapezium in which AD || BC,
ABC = 90°, AD = 16 cm, AC = 41 cm and BC = 40 cm. Find the
area of the trapezium,
Answer:
252 cm²
Step-by-step explanation:
Find AB:
AB² = 41² - 40²
AB² = 81
AB = √81
AB = 9 cm
Area of the trapezium = ½(a + b) × h
Where,
a = 16 cm
b = 40 cm
h = 9 cm
Area = ½(16 + 40) × 9
Area = ½(56)×9
Area = 252 cm²
Write the verbal phrase as a algebraic expression
twice a number divided by 7
Please answer correctly !!!!!!!!!!!!!!! Will mark Brianliest !!!!!!!!!!!!!!!!
Answer:
19
Step-by-step explanation:
Answer:
the next side would be 65 i think
Step-by-step explanation:
Match each table to the slope it represents
Answer:
I dont see anything how am I supposed to
I don't know how doing this
Slope intercept form - y = m(x) + b. m represents slope, b represents the y-intercept. You should be able to plug in any value for y and x into the equation, and it should result in a true statement.
The y-intercept is easy to find. It is the point where X is equal to zero and the graph line crosses through the y axis. In this case, y intersects at -2. Since we insert the y intercept at b, we can go ahead and plug it in there.
y = m(x) + b > y = m(x) - 2
Since there is only one option with the y intercept equalling -2, you can go ahead and pick D) y = -x - 2 as your answer, since no other options have the correct y-intercept.
Which strategy below would NOT get you.a
accurate estimation of 33% of 146.7?
A) Round the percent and find 30% of 146.7
B) Round the number and find 33% of 150
C) Use benchmark percent and find 50%
of 146.7
Round the percent and number and
find 30% of 150
D)
All of them would be an accurate
estimation.
E)
Answer:
C) Use benchmark percent and find 50% of 146.7Step-by-step explanation:
Accurate estimation of 33% of 146.7
A) Round the percent and find 30% of 146.7
Acceptable, rounded down the %B) Round the number and find 33% of 150
Acceptable, rounded up the numberC) Use benchmark percent and find 50%
of 146.7
NOT acceptable as 50% is too much for 33%D) Round the percent and number and
find 30% of 150
Acceptable, both % and the number roundedE) All of them would be an accurate estimation
No, option C onlyThe population of a colony of mosquitoes obeys the law of uninhibited growth. If there are 1000 mosquitoes initially and there are 1500 after 1 day, what is the size of
the colony after 3 days? How long is it until there are 80,000 mosquitoes?
The size of the colony after 3 days is approximately mosquitoes.
Answer:
There are 2,500 misquitos after 3 days and it takes 158 days to reach 80,000 mosquitos.
23% of what number is 36? please help
O 36 = (0.23)x
O x = (0.23)(36)
O 36 = 23x
O x = (23)(36)
20 point question pls help math
its B 15 divide by 3 is 5 because 2 - 5 is -3 - 15 is 5
Can some one really help meee please!
Answer:
The bigger figure's area is 20m, and the smaller is 6m. :)
Step-by-step explanation:
Answer:
The bigger figure's area is 20m, and the smaller is 6m.
Step-by-step explanation:
bc i know
A survey of 100 randomly selected dentists in the state of Ohio results in 78% who would recommend the use of a certain toothpaste. The population proportion is known to be p=0.72. For samples of size 100, which of the following best interprets the mean of the sampling distribution of sample proportion of dentists in the state of Ohio who would recommend the use of a certain toothpaste?
Answer:
I think its A
Step-by-step explanation:
Answer:
The mean of all sample proportions from all random samples of 100 dentists in the state of Ohio is equal to 0.72.
Step-by-step explanation:
Coach Wallace wants to raise $1,500 for swim club. His goal is to raise $25 a day (d).
Which equation models this situation?
Answer: 25d = 1,500
Step-by-step explanation: i have no explanation, sorry if you need one i will work it out but if you just need the anwser, there it is .
solve 10x+7-8x=6
expressions and equations
Answer:
2+7
Step-by-step explanation:
Original price: $110; Markdown: 30%
Answer:
30% of $110 equals $33.
The inverse function of f(x)= 1/2x +10 shown.
h(x) =2x- ____
What’s the missing value
Answer:20
Step-by-step explanation:
y=1/2x+10
1/2x=y-10
x=2y-20
y=2x-20
A student wrote and simplified an expression for the perimeter of the rectangle. (Using the picture provided.)
perimeter.
Explain the mistake that was made in the simplified expression. Include the correct simplified expression in your explanation. Be sure to use math vocabulary words.
Answer:
Again...
Step-by-step explanation:
A publishing company conducted a survey asking readers whether they use e-readers. Of the 3,000 readers surveyed, 1,954 said they read books on an e-reader. Use this information to complete the statement. Round your answers to the nearest hundredth.
Answer: See explanation
Step-by-step explanation:
You didn't say what you would like to calculate but based on tbe information given in the question, I guess that you want to calculate the percentage of readers who use an e-reader. This will be:
Number of readers surveyed = 3,000
Number of readers reading on e-reader = 1,954
Percentage of e-readers would then be:
= (1954 / 3000) × 100
= 65.13%
This is for math to get my grade up. PLEASE HELP ASAP
Answer:
the correct answer is b
Step-by-step explanation:
I don’t know which one to select
Answer:
B
Step-by-step explanation:
Divide by pir^2 to get h all by itself and you'll have V/pir^2 = h
[tex]\sf{\bold{\green{\underline{\underline{Given}}}}} [/tex]
⠀⠀⠀⠀
V = π r² h______________________
[tex]\sf{\bold{\green{\underline{\underline{To\:Find}}}}} [/tex]
⠀⠀⠀⠀
Correct option = ??______________________
[tex]\sf{\bold{\green{\underline{\underline{Solution}}}}} [/tex]
⠀⠀⠀⠀
V = π r² h
⠀⠀⠀⠀
Using equations formulae⠀⠀⠀⠀
[tex]\sf \dfrac{V}{\pi} = r² h [/tex]
⠀⠀⠀⠀
[tex]\sf \dfrac{V}{\pi\times r^2} = h [/tex]
⠀⠀⠀⠀
checking correct option⠀⠀⠀⠀
Option 1 :
⠀⠀⠀⠀
[tex]\sf \bigg( h = \dfrac{V}{\pi r^2} \bigg) \neq ( h = V - \pi r^2) [/tex]
⠀⠀⠀⠀
This option is not correct
⠀⠀⠀⠀
Option 2 :
⠀⠀⠀⠀
[tex]\sf \bigg( h = \dfrac{V}{\pi r^2} \bigg) [/tex] = [tex]\sf \bigg( h = \dfrac{V}{\pi \times r^2} \bigg) [/tex]
⠀⠀⠀⠀
This option is correct
⠀⠀⠀⠀
Option 3 :
⠀⠀⠀⠀
[tex]\sf \bigg( h = \dfrac{V}{\pi \times r^2} \bigg) \neq ( h = V\pi r² ) [/tex]
⠀⠀⠀⠀
This option is not correct
⠀⠀⠀⠀
Option 4 :
⠀⠀⠀⠀
[tex]\sf \bigg( h = \dfrac{V}{\pi \times r^2} \bigg) \neq ( h = V - \pi - r^2) [/tex]
⠀⠀⠀⠀
This option is not correct
______________________
[tex]\sf{\bold{\green{\underline{\underline{Answer}}}}} [/tex]
⠀⠀⠀⠀
Correct answer = option B18 is 40% of what number
Answer: 45
Step-by-step explanation:
40% × ? = 18
18 ÷ 40% =
18 ÷ (40 ÷ 100) =
(100 × 18) ÷ 40 =
1,800 ÷ 40 =
45
Answer: 45
Step-by-step explanation:
Solve using graphing substitution or elimination in the picture
Answer:
1) 18 quarters and 30 nickels2) 8 quarters and 12 nickelsStep-by-step explanation:
1) Let quarters be x and nickels be y.
Equations based on given, 48 coins, total of $6 = 600c:
x + y = 4825x + 5y = 600Substitute y in the second equation, y = 48 - x
25x + 5(48 - x) = 60025x + 240 - 5x = 60020x = 360x = 18Then value of y is:
y = 48 - 18 = 302) Similarly to problem 1.
x + y = 2025x + 5y = 260Substitution: y= 20 - x
25x + 5(20 - x) = 26025x + 100 - 5x = 26020x = 160x = 8Then finding y:
y = 20 - 8 = 12What is the range of the graph above?
