1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
harina [27]
4 years ago
10

How much of a radioactive substance must be presented to decay to 40 grams in 9 years if the half-life of the substance is 4.6 y

ears?
Mathematics
1 answer:
leonid [27]4 years ago
6 0

Answer:

155.25 grams

Step-by-step explanation:

40 = X(½^(9/4.6))

X = 40 ÷ (½^(9/4.6))

X = 155.25 grams

You might be interested in
Joy wants to save $50 to buy a pair of roller blades. He plans to save $2 in the first month, $4 in the second month, $6 in the
Alika [10]

Answer:

it will take joy 7 months to buy a pair of roller blades.

Step-by-step explanation:

50

2,4,6,8,10,12,14

i think this is the right answer as you did not put the whole question

so i assume it keeps on going up in 2s.

hope this helps

3 0
2 years ago
Need help with this question
mixer [17]

Hey there!!

How do we find the equation of a line ?

Ans : We take the slope and the y - intercept and get them together.

How do you find slopes?

Ans - In order to find slop, we will need to use the slop formula which is

( y₂ - y₁ ) / ( x₂ - x₁ )

The two points shown in the above question are

( 4 , -8 ) and ( 8 , 5 )

y₂ = 5 , y₁ = -8 and x₂ = 8 , x₁ = 4

Now plug in the values:

( 5 + 8 ) / ( 8 - 5 )

13 / 3

Hence, the slope is 13/3

The basic formula : y = mx + b

Where b is the y-intercept and m is the slope.

We have found the slope, hence, the formula would become

... y = 13/3 x + b

Now take a coordinate and substitute it .

I will take ( 8 , 5 )

x = 8 and y = 5

Now plug in the values

... 5 = 13/3 × 5 + b

... 5 = 65/3 + b

Subtract 65/3 on both sides

... 5 - 65/3 = b

... -50/3 = b

Hence, the y-intercept is -50/3

Now plug in all the values to get the total equation...

The final equation : y = 13x/3 - 50/3

... y = 13x - 50 / 3

Hope my answer helps!!

3 0
3 years ago
Can to answer all 4 please?
Tasya [4]
1) A - yes, b - no, c -  yes
2) false, true, false
3) 85p - 34%
      xp - 66%
x = 165 - she has to read 165 more pages.
4) Sylvia earns 84/12 = 7$/hr
maximum she can earn is 7*15 = 105 $
she will earn 105$ if she works for 15 hours
5 0
3 years ago
a set of data has a normal distribution with a mean of 29 and a standard deviation of 4. find the percent of data between 25 and
Volgvan

Answer:15%

Step-by-step explanation:

fr fr

6 0
3 years ago
In rhombus MOTH, angle HTM=(5x+6) degrees. If angle HMO=(12x-6)degrees, what is angle HMO?
forsale [732]

Answer:

m∠HMO=102°

Step-by-step explanation:

we know that

In a Rhombus the diagonals bisect the angles and opposite angles are equal

In this problem

Angles HMO and HTO are opposite angles

m∠HMO=m∠HTO

m∠HTM=(1/2)m∠HMO ----> because the diagonals bisect the angles and opposite angles are congruent

substitute the values

(5x+6)\°=(1/2)(12x-6)\°

solve for x

10x+12=12x-6\\12x-10x=12+6\\2x=18\\x=9

<em>Find the measure of angle HMO</em>

m∠HMO=(12x-6)°

substitute the value of x

m∠HMO=(12(9)-6)=102°

see the attached figure to better understand the problem

5 0
4 years ago
Other questions:
  • a toy manufacturer needs a piece of plastic in the shape of a right triangle with the longer leg 6cm more than the shorter leg a
    15·1 answer
  • I need help ASAP snsnnsbsbsbs
    12·2 answers
  • F(x) = 3/(x + 2) - sqrt(x - 3) complete the following statement: f(19)=
    5·1 answer
  • Find the slope of the line.<br> 9x+y=9
    5·1 answer
  • Which angles below are complementary angles and which are supplementary angles?
    13·1 answer
  • Use the formula A=Pe^rt to find the balance if $2000 is deposited into an account paying 4% interest compounded continuously for
    12·1 answer
  • How do u solve this?​
    10·1 answer
  • A cell phone call costs $0.08 per minute. How much would a 6-minute call cost? ​
    15·2 answers
  • Divide 6q by q please solve this and help me to get out of this​
    12·2 answers
  • (-6,-4), (3,-4) find the slope
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!