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shepuryov [24]
3 years ago
8

Write an equation to model each problem. Solve the equation.

Mathematics
1 answer:
jenyasd209 [6]3 years ago
8 0

Answer:

1) The equation of the temperature in function of the time is

T(t) = 12 - 2t, with t in hours

The temperature is -4F after 8 hours, so, at P.M.

2) 6.75 = 7.50r

Her rate of deductions is 10% a day.

Step-by-step explanation:

1) This problem can be modeled by a first order equation

T(t) = T(0) + rt

In which T(0) is the temperature at instant zero and r is the rate of growth(r>0) or decline(r<0).

Since at 12 noon, the temperature outside is 12F, T(0) = 12. The temperature drops at the steady rate of 2F an hour, so r = -2.

The equation of the temperature in function of the time is

T(t) = 12 - 2t, with t in hours

The temperature is -4F when

-4 = 12 - 2t

2t = 16

t = 8h

The temperature is -4F after 8 hours, so, at P.M.

2) This problem can be modeled by the following first order equation

P = rP(0).

Where P is her pay, r is the rate of the initial money that Zelly takes home and P(0) is her initial pay.

In hour problem, we have that P = $6.75 and P(0) = $7.50.

So

6.75 = 7.50r

r = \frac{6.75}{7.50}

r = 0.9

r = 0.9 means that Zelly keeps 90% of her pay. It means that her rate of deductions is 10% a day.

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The lowest terms for 19/31 would be 1
7 0
3 years ago
How to find the area of a sector with a sector angle of 72 degrees and a radius of 14 cm​
skad [1K]

Answer:

Exact area: 39.2π cm²

Approximate area: 123.2 cm²

Step-by-step explanation:

The area of a circle is πr².

A full circle can be thought of as a sector of a circle with 360° of central angle. For a sector of a circle with a central angle of n°, multiply the area of the circle by the fraction n°/360°.

The formula for the area of a sector of circle with central angle n° and radius r is

A = (n°)/(360°) × πr²

Here we have n = 72; r = 14 cm

A = (n°)/(360°) × πr²

A = (72°)/(360°) × π × (14 cm)²

A = 39.2π cm² = 123.2 cm²

7 0
1 year ago
I need the answer fast please
shusha [124]
The diameter of the circle is needed. But to solve, you would simply multiply the diameter of the circle by pi (3.14).
3 0
2 years ago
Which shows the correct method for solving the equation below?<br> 1/3 (y-9) =3
iragen [17]

Answer:

y=18

Step-by-step explanation:

we have

\frac{1}{3}(y-9)=3

Multiply by 3 both sides

3*(\frac{1}{3}(y-9))=3*3

(y-9)=9

Adds 9 both sides

(y-9)+9=9+9

y=18


5 0
3 years ago
Read 2 more answers
Can one of you help me pls it's urgent
ioda

Answer:

Hello,

I am pretty sure that is is the last answer. 3√3.

Step-by-step explanation:

I hope this helps!

6 0
3 years ago
Read 2 more answers
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