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
jek_recluse [69]
3 years ago
9

The population of a bacteria after x number of hours is modeled by the expression 1 , 000 ( 0 . 75 ) x . What is the rate of dec

ay of the population of bacteria? A. 25% B. 75% C. 0.75% D. 1.25%
Mathematics
2 answers:
DerKrebs [107]3 years ago
7 0

Answer:

A. 25%

Step-by-step explanation:

If you multiply something by 0.75, you're multiplying it by 75%, and that means you're losing 25% each time, so the rate of decay is 25%

Afina-wow [57]3 years ago
4 0

Answer:

A 25%

Step-by-step explanation

the first thing we want to do for this problem is look at the exponential decay formula. its y=a(1-b)^x. "y" represents the final amount, "a" represents the original amount, and "b" represents the decay factor.

in this situation, .75 is the decay factor and our original amount is 1000. so to find out the decay factor, we need to subtract .75 from 1. you would get .25. .25 in percentage form is 25%.

we can double check by putting .25 in the orginal exponential decay formula. y=1000(1-.25)^x. 1-.25 equals .75, so now the equation is the same as our original equation, y=1000(0.75)^x

You might be interested in
I’ve done question a. But can you help me on b and c
spin [16.1K]

Answer:

Step-by-step explanation:

b) Diameter of Mercury = 4.88 * 10³ = 4.88 * 1000 = 4880 km

Radius of Mercury = 4880÷ 2 = 2440 km

c) Mass of Jupiter = 1.898 * 10²⁷ = 18.98 * 10²⁶

Mass of Saturn = 5.68 * 10²⁶

Difference  = 18.98 * 10²⁶ - 5.68*10²⁶

                   = (18.98 - 5.68) * 10²⁶

                   = 13.30 * 10²⁶

                   = 1.330 * 10²⁷

4 0
3 years ago
Determines whether the line through the points
kotegsom [21]
Find their gradients using the change in y coords divided by the change in x coords. once you have the gradients (or slopes), multiply them by eachother - if the product is (-1) then theyre perpdendicular, if not, they are either parallel or intersect at a point
5 0
3 years ago
Find the value of X.
Kobotan [32]

Answer:

x = 18.46

Step-by-step explanation:

Find the last angle of the triangle.

180-90-72 = 18

The cosine of an angle is equal to the ratio of the adjacent side to the hypotenuse.

cos(b) = adj/hyp

CosB=a/c rewrite to get

6/CosB (72)  = 19.41

Find the last side of the triangle using the Pythagorean theorem.

b=square root c^2 - a^2

b=square root 376.99 - 36

b= 18.46

3 0
3 years ago
Regina owns a book store. She sold 87, 94, 91, and 84 books on the first 4 days of this week. Regina wants to have a mean of 90
andre [41]

Answer:

If Regina wants a mean of 90, she needs to sell 94 books on the 5th day.

3 0
2 years ago
Today, Bill is driving to Baltimore, MD. He has 18 gallons of gas in his tank. His tank uses 2 gallons of gas every hour he driv
Tom [10]

Answer:

9

Step-by-step explanation:

18/2=9

8 0
3 years ago
Other questions:
  • What is Eight less than two cubed, plus twenty divided by five ​
    13·1 answer
  • The sum of six number is 33. What is their mean?
    13·2 answers
  • Simplify x^2+3x+2/x+1<br><br> A. X+2<br> B. X-2<br> C. X^2+1<br> D. X^2-1
    15·1 answer
  • What's the awnser to this
    10·2 answers
  • The standard normal curve shown below models the population distribution of a random variable. What proportion of the values in
    6·1 answer
  • What is the conjugate of the square root of -15 ? ...?
    14·1 answer
  • If 7 liters of petrol cost $14.70, calculate the cost of 15 liters of petrol.​
    13·2 answers
  • What will be the area of the shaded part ?
    13·1 answer
  • 1 cup = ___1/2 cups<br><br> 1 cup= ___ 1/4 cups<br><br> 1 cup= ___ 1/3 cups
    8·1 answer
  • Tell whether the sequence is arithmetic if it is what is the common difference -15, -9, -3, 3, . . .
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!