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2 years ago

Plz help! will mar brainliest.

Mathematics

2 answers:

OleMash [197]2 years ago

4 0

Answer:

From -2<x<-1, the function F(X) is increasing. (B)

Really, it increases all from around -2.5<x<0.5

C is also the second answer, as it increases til around 2.5

It is decreasing from -4<x<-3. But increases right after. It then starts to slow down around x = 1 and go down again.

Which means (B) is your answer.

If you want to get fancy, its a polynomial and if you take the derivative for instantaneous rate, you will see f prime is increasing if you make an example function.

Scorpion4ik [409]2 years ago

4 0

Answer:

-2,5 < x < 1

is the simplified and truncated value

Step-by-step explanation:

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A welder drops a piece of red-hot steel on the floor. The initial temperature of the steel is 2,500 degrees Fahrenheit. The ambi

sergey [27]

Answer: After 18.05 minutes, the temperature of steel becomes 100 degrees.

Step-by-step explanation:

Since we have given that

Initial temperature = 2500

At t = 0,

we get that

$f(t)=Ce^{-kt}+80\\\\2500=C+80\\\\2500-80=C\\\\2420=C$

After 2 minutes, the temperature of the steel is 1500 degrees.

so, it becomes,

$1500=2420e^{-2k}+80\\\\1500-80=2420e^{-2k}\\\\\dfrac{1420}{2420}=e^{-2k}\\\\0.587=e^{-2k}\\\\\ln 0.587=-2k\\\\-0.533=-2k\\\\k=\dfrac{0.533}{2}\\\\k=0.266$

So, We need to find the number of minutes when the temperature of steel would be 100 degrees.

So, it becomes,

$100=2420e^{-0.266t}+80\\\\100-80=2420e^{-0.266t}\\\\20=2420e^{-0.266t}\\\\\dfrac{20}{2420}=e^{-0.266t}\\\\\ln \dfrac{20}{2420}=-0.266t\\\\-4.8=-0.266t\\\\t=\dfrac{4.8}{0.266}\\\\t=18.05$

Hence, after 18.05 minutes, the temperature of steel becomes 100 degrees.

7 0

2 years ago

Write an exponential equation in the form y = ab^x whose graph passes through points (4, 8) and (6, 32).

luda_lava [24]

Answer:

(1,4),(2,12)

----------

The form is y = ab^x

12 = ab^2

4 = ab^1

------------

Divide the 1st by the 2nd to get:

3 = b

--------

Substitute that into the 2nd equation to solve for "a":

4 = a*3^1

a=(4/3)

-------------

EQUATION:

y = (4/3)*2^x

==================

Step-by-step explanation:

5 0

3 years ago

Sasha found the product of 1/8 x 40 to be 5. Use that information to find the product of 7/8 x 40

Arte-miy333 [17]

Image it like a pizza

The whole pizza is 40 calories and cut into 8 slices. 1 slice has 5 calories. If you ate 7 pizzas out of the eight, how many calories would you consume. therefore 7x5= 35

so 7/8x40=35

5 0

1 year ago

Melody is trying to save for a new tablet. She

Hatshy [7]

Answer:

15x + 150

Step-by-step explanation:

15x+ 150

15x= $ saved per week

150= what she has

3 0

2 years ago

Read 2 more answers

Mike wants to paint one wall of his room.The wall measures 12 feet by 9 feet. On the wall is one square window the measures 4 1/

Iteru [2.4K]

12*9= 108
4.5*4.5= 20.25
180-20.25= 159.75
answer is D

5 0

2 years ago