How much of a radioactive kind of niobium will be left after 105 days if you start with 3,920 grams and the half-life is 35 days?
Answer:
"490 grams" would be the correct solution.
Step-by-step explanation:
The given values are:
Half time,
T = 35 days
Total time,
t = 105 days
As we know,
⇒ [tex]A=A_o(\frac{1}{2} )^{\frac{t}{T} }[/tex]
On substituting the values, we get
⇒ [tex]=3920\times (\frac{1}{2})^{\frac{105}{35} }[/tex]
⇒ [tex]=3920\times (0.5)^3[/tex]
⇒ [tex]=3920\times 0.125[/tex]
⇒ [tex]=490 \ grams[/tex]
Round 1.5 to one decimal place
Answer:
2
Step-by-step explanation:
Since rounding to the one place relies on the decimal part, the part to focus on is the .5
becuase anything greater or equal to 5 is rounded up, the answer is 2
1.5 rounded to one decimal place will be 2.
What are Places' values?Place value can be defined as the value represented by a digit in a number on the basis of its position in the number.
Given a fraction number 1.5 that needed to be rounded to one decimal place. Since it's at the equidistance from the nearest whole number then we will follow the even number rule.
Rounds towards the nearest neighbor, but if equidistant, it rounds towards the even number. Both 1.5 and 2.5 are rounded to 2
therefore, 1.5 will be 2, when rounded to the nearest tenth.
Learn more about place values here:
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What is 3809 divided by 5 long division
Answer:
761 R 4
Step-by-step explanation:
0 7 6 1
5 3 8 0 9
− 0
3 8
− 3 5
3 0
− 3 0
0 9
− 5
4
PLease help! Both images down below!
verify the following:
1. (-2/3)6 = 64/729
HELP HELP HELP HELP !!!!!!
Answer:
5
Step-by-step explanation:
that is what I know and if I'm wrong please tell me right away I'll try it out again thank you
Answer:
5 meters
Step-by-step explanation:
The room is rectangular, so the two walls and the diagonal (distance between opposite corners) form a right triangle.
We can use [tex]a^2 + b^2 = c^2[/tex] to compute the other wall's length:
[tex]13^2 = 12^2 + x^2\\169 = 144 + x^2\\25 = x^2\\x = \pm 5[/tex]
Write a system of linear equations to model this situation where x represents the pizza and y represents the bags of wings. Use the system to answer the following questions.
Answer:
x - 3
i don't have the explanation for this lol
Kerel wants to buy a Points card for his X-box live account. He can buy a 200-point
card for $10.00 or a 300-point card for $15.00. Which card is the better value?
Answer:
equal. i think
Step-by-step explanation:
well if 10$ is worth 200 and 15 is worth 300 for me its adding half of the orginal number (200) and get 100 so 200+100=300
Both the cards are having the same value
What is an Equation?
Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.
It demonstrates the equality of the relationship between the expressions printed on the left and right sides.
Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.
Given data ,
Let the first card be = A
Let the second card be = B
Now ,
The value of first card = $ 10.00
The value of second card = $ 20.00
And ,
The total value for 200 point cards = value of first card
The total value for 300 point cards = value of second card
So , the equation will be
200 = 10 A be equation (1)
300 = 15 B be equation (2)
Divide equation (1) by 10 on both sides , we get
A = 20
Divide equation (2) by 15 on both sides , we get
B = 20
Therefore , A = B
Hence , Both the cards are having the same value
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Simplify the mathematical expression below.
Answer:
Step-by-step explanation:
Lin's job pays $8.25 an hour plus $10 of transportation allowance each week. She has to work at least 5 hours a week to keep the job, and can earn up to $175 per week (including the allowance). Represent this situation mathematically in two inequalities. Let `x` represent the number of hours Lin works in a week. Inequality 1:
Answer:
Kindly check explanation
Step-by-step explanation:
x = number of hours Lin works in a week
Inequality (1) : Least Numbe rod hours worked
x ≥ 5 - - - (1)
Possible earning including transportation allowance :
8.25x + 10 ≥ 175 - - - (2)
Solving for X from (2)
8.25x ≥ 175 - 10
8.25x ≥ 165
x ≥ 20 hours
To earn upto 175 per week, then he has to work for 20 hours
You want to determine the height of the screen at a drive-in movie theater. You use a cardboard square to line up the top and bottom of the screen structure. The vertical distance from the ground to your eye is 5.5 ft and the horizontal distance from you to the screen is 14 ft. The bottom of the screen is 6 feet from the ground. Approximate the height of the screen to the nearest tenth.
I hope this helps with your question.
josiah pays $18 for a DVD that originally cost $20. what is the percent decrease in the cost of the DVD?
Answer:
It should be 10%
What is the missing term?
Answer:
3x²
Step-by-step explanation:
x is to the left, and 3x is below.
x × 3x = 3x²
Is the following triangle a right triangle?
Yes Or No ?
Please answer correctly! I will mark you as Brainliest!
Answer:
1000 cubic cm
Step-by-step explanation:
20 x 5 x 10 = 1000 cubic cm
The photo has a width of 720 pixels. The photo has a height of 540 pixels.
(a) Write down the ratio of the width of the photo to the height of the photo. Give your ratio in its simplest form.
Step-by-step explanation:
720 : 540
simplify to get the answer^
Which statements are true about the area of a circle? check all that apply
Answer:
circle is measured by 360°
Step-by-step explanation:
circle half of 180°
Which shapes have 2 pairs of parallel sides? Choose ALL that are correct
Answer:
rectangle, square
Step-by-step explanation:
those shapes have 2 sides of parallel sides.
H E L P
what is the slope??
The measure of L in triangle LMN is 32°. The measure of M is 69°. What is the measure of N?
A.
79°
B.
259°
C.
101°
D.
37°
Answer:
A) 79
Step-by-step explanation:
m<N = x
All angles in a triangle add up to 180 so:
x + m<L + m<M = 180
x + 32 + 69 = 180
x + 101 = 180
x = 180 - 101
x = 79
Answer:
It is (A) 79°
The summation of the triangle's angles are 180°
Step-by-step explanation:
[tex]m + l + n = 180 \\ 69 + 32 + n = 180 \\ n = 180 - 101 \\ n = 79 ^{ {} ^{.} } [/tex]
please help with simplifying
Answer:
1. 9/16
2. 3/25
3. 1
Step-by-step explanation:
The altitude on a ski trail drops 2 feet for
every 5 feet of horizontal distance traveled,
The end of the trail has an altitude of
4,000 feet and is a horizontal distance of
2000 feet from the start,
a. Write an equation in point-slope form
that represents this situation, and
graph the equation.
Answer:
rrrrrehwhwjwmkwwuwiwiiwiwiwiw
10. Amanda covers the outside of a box, shown in the diagram below, with
decorative paper for a school project. The top of the box is open.
3 in
7 in.
8 in
If the paper costs $0.03 per square inch, what is Amanda's total cost?
Answer:
1/2 of an answer is zero answer.
DUE IN 30 MINTUES!!!!!PLEASEEE HELP!!!
You need to purchase supplies for the trip. You have $1000 to spend.
Oxen: $40 each
Food: $0.20 per lb
Clothing: $10 per set.
Matt also charges 9% tax
Purchase at least 2 oxen, 500lbs of food, and 5 sets of clothing. You may want to purchase more.
Select the amount of items and find the total cost including tax
I GIVE YOU BRAINLIEST!!!
The graph of function f is shown.
Function g is represented by the table.
x -1 0 1 2 3
g(x) 24 4 0 -4/5 -24/25
Which statement correctly compares the two functions?
A. They have the same x- and y-intercepts.
B. They have different x- and y-intercepts but the same end behavior as x approaches ∞.
C. They have the same y-intercept and the same end behavior as x approaches ∞.
D. They have the same x-intercept and the same end behavior as x approaches ∞.
(−7,−1),(2,26),(x,14)
Find the value of x
Answer:
Im pretty sure it is 3. Tell me if I am wrong!!!
Step-by-step explanation:
I Hope This Helps :)
The output of a flashlight is 2.0 x 10 lumens. If 1 lumen is about 1.464 x 10 3 watts, then
what is the output of the flashlight in watts?
A 7.32 x 10^-6
B 7.32 x 10^-5
C 2.93 x 10^-2
D 2.93 x 10^-1
Find the missing side lengths.
Can someone help me?
9514 1404 393
Answer:
m = n = 5√2
Step-by-step explanation:
The mnemonic SOH CAH TOA reminds you ...
Sin = Opposite/Hypotenuse
sin(45°) = m/10
m = 10·sin(45°) = 10·(√2)/2 = 5√2
The triangle is isosceles, so m = n.
n = m = 5√2
_____
The side ratios of an isosceles right triangle are 1 : 1 : √2. That is, the legs are 10/√2 = 5√2 in this triangle. It can be useful to remember these ratios for this "special" triangle.
Which equation is represented by the graph below?
1) y = 5*
2) y = 0.5
3) y = 5*
4) y = 0.5-*
Answer:
0.5^x
Step-by-step explanation:
I need to print x photos for my scrapbook I called two different stores to ask about the cost of printing photos The first store charges a fee of $3.79 to use the photo machine and then an additional $0.25 per photo. The second store charenly a $0.99 fee to use the photo machine, but the additional cost per photo is $0.35 After comparing the two stores, I realize my overall cost will be the same at each store. What is the value of x, the number of photos I need to print?
Answer:
x=28
Step-by-step explanation:
3.79+0.25x=0.99+0.35
-0.35x -0.35x
3.79+-0.10x=0.99
-3.79 -3.79
-0.10x=-2.8
-0.10x/-2.8
x=28