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Dmitry_Shevchenko [17]
3 years ago
5

Keith is saving money for a car. He has saved the same amount each year for the past three years, and records of how much he has

at the end of each year in the table below.
What is Keith's unit rate of change of dollars with respect to time; that is; how much does Keith save in one year?

the unit rate is blank dollar per year.​

Mathematics
2 answers:
insens350 [35]3 years ago
8 0

Answer:

keith saves 1500 dollars per year

Sever21 [200]3 years ago
4 0

Answer:

keith saves $1500 a year.

graph is underneath

Step-by-step explanation:

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The half-life of caffeine in a person’s bloodstream is about 6 hours. If a person’s bloodstream contains 80 milligrams of caffei
Luda [366]
To calculate the remaining caffeine, we use the radioactive decay formula which is expressed as An = Aoe^-kt where An is the amount left after t time, Ao is the initial amount and k is a constant we can calculate from the half-life information. We do as follows:
 at half-life,
ln 1/2 = -k(6)
k = 0.12/hr

An = 80e^-0.12(14)
An = 15.87 mg
5 0
3 years ago
La funcion que representa el beneficio obtenido por una empresa si vende x unidades de uno de sus productos es f(x)= -70x^2+2800
DerKrebs [107]

Answer:

20

Step-by-step explanation:

La función es

f(x)=-70x^2+2800x-45000

Diferenciando con respecto a x obtenemos

f'(x)=-140x+2800

Igualar con cero

0=-140x+2800\\\Rightarrow x=\dfrac{2800}{140}\\\Rightarrow x=20

Doble derivada de la función

f''(x)=-140

Entonces, la función es máxima cuando el número de unidades vendidas,  x=20,

3 0
3 years ago
In great detail, with full work done out, please find x<br> 1 + x = 2
kenny6666 [7]

Answer:

x = 1

Step-by-step explanation:

1 + x = 2

Subtract 1 form both sides,

1 + x - 1 = 2 - 1

       x  = 1

4 0
3 years ago
there are 18 boys and 12 girl in math class. what is the ratio of girls to total students. A. 18:30 B. 12:30 C. 30:12 D. 30:18 2
zmey [24]

Answer:

1.  B

2. B and C

3.C

4.B the answer is 238 but i guess the rounded

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Clarisse used the ordered pairs (0, 13) and (24, 5) for her trend line. What would be the y-intercept of her trend line?
laila [671]

Answer:

Step-by-step explanation:

Remark

You have 2 points to solve the equation y = mx + b. After finding m, use either of the points to find b.

Formula

y = mx + b

m = (y2 - y1)/(x2 - x1)

Solution

  • y2 = 13
  • y1 = 5
  • x2 = 0
  • x1 = 24

m = (13 - 5)/(0 - 24)

m = 8 / - 24

m = - 1/3

y = mx + b

y = -1/3 x + b

Use (0,13)  as the point.

13 = -1/3 * 0 + b

13 = b

The y intercept = (0,13)

5 0
3 years ago
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