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
garri49 [273]
3 years ago
7

Thirty percent of a radioactive substance decays in four years.

Mathematics
1 answer:
wel3 years ago
8 0

Answer:

The substance decays by 7.5% every year

Step-by-step explanation:

You might be interested in
Please help quickly!
Anuta_ua [19.1K]

Answer:3100 with 9%

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
2^x-1=128<br><br><br> show work pls! thank u :)
hichkok12 [17]

Hello from MrBillDoesMath!

Answer:

Take you pick below!   (either x 8 or x = 7.01, approx, depending how the question is interpreted)




Discussion:

Interpretation 1

If the question is   2^(x -1)  = 128, then as 2^7 = 128,

x-1 = 7 so x = 8



Interpretation 2

If the question is (2^x -1) = 128, then..

2^x  = 128 + 1 = 129  =>

log(2^x) = log(129) =>

xlog(2) = log(129) =>

x = log (129) / log2 = 7.01

Regards,  

MrB

4 0
3 years ago
Add 620 grams to 3.7 kilograms.give your answer in kilogram
Alla [95]
3.7kg is also equal to 3700 grams
3700+620 grams
= 4320 grams
= 4320/1000 kg
= 4.32 kg
3 0
2 years ago
Read 2 more answers
Which expression is equivalent to the area of square A, in square inches?
mezya [45]

Answer:

the required expression equivalent to the area of the square A in inches is (10² + 24²).

Step-by-step explanation:

7 0
2 years ago
A system of equations is graphed on the coordinate plane. y=−6x−3y=−x+2 What is the solution to the system of equations? Enter t
Mamont248 [21]
If you equate both, the y is eliminated:

-6x-3 = -x+2

Simplify this to find x:

-5x = 5
x = -1

Fill in x=-1 in either equation:

y = --1 + 2 = 3

So (-1,3) is the solution, it is where the lines intercept.
6 0
3 years ago
Read 2 more answers
Other questions:
  • Please answer this question !! Will give brainliest to the best answer and 30 points !!
    13·2 answers
  • If the federal reserve sets the reserve rate at 20%, what is the resulting money multiplier
    13·2 answers
  • How many real solutions does p^2-5p+7=0 have
    11·1 answer
  • Seira has 11.5 yards of yarn. She uses a certain amount for a project, leaving 5.25 yards of yarn. The equation (11.5-x=5.25) re
    6·1 answer
  • 87,1/2% of 96 = Z<br> Please tell me HOW to do it!
    12·1 answer
  • Place parentheses in the expression so that it equals the given value. 12 x 2 + 2^3
    5·1 answer
  • 2) Paul has two and two-thirds pounds of peanuts and a quarter of a pound of cashews . How many more pounds of cashews does he h
    11·1 answer
  • True or False percent markup on selling price can be converted to percent markip on cost by formula?
    9·1 answer
  • In the figure below, point O is the center of the circle and mRQ=35.
    13·1 answer
  • Did i do 1 correctly
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!