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Alja [10]
3 years ago
15

In a survey of 2100 people who owned a certain type of​ car,735 said they would buy that type of car again. What percent of the

people surveyed were satisfied with the​ car?
Mathematics
1 answer:
bekas [8.4K]3 years ago
8 0

Answer:

35%

Step-by-step explanation:

the percent is given by the ratio 735 / 2100 = 7/20 = 0.35

which in percent form is 35%

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Which two charges have a sum of 0?
Roman55 [17]

Answer:

7-7=0 or -7+7=0

hope i helped you :)

7 0
3 years ago
A pizza pan is removed at 9:00 PM from an oven whose temperature is fixed at 450°F into a room that is a constant 70°F. After 5​
gladu [14]

Answer:

A) It will get to a temperature of 125°F at 9:19 PM

B) It will get to a temperature of 150°F at 9:16 PM

C) as time passes temperature approaches the initial temperature of 450°F

Step-by-step explanation:

We are given;

Initial temperature; T_i = 450°F

Room temperature; T_r = 70°F

From Newton's law of cooling, temperature after time (t) is given as;

T(t) = T_r + (T_i - T_r)e^(-kt)

Where k is cooling rate and t is time after the initial temperature.

Now, we are told that After 5​ minutes, the temperature is 300°F.

Thus;

300 = 70 + (450 - 70)e^(-5k)

300 - 70 = 380e^(-5k)

230/380 = e^(-5k)

e^(-5k) = 0.6053

-5k = In 0.6053

-5k = -0.502

k = 0.502/5

k = 0.1004 /min

A) Thus, at temperature of 125°F, we can find the time from;

125 = 70 + (450 - 70)e^(-0.1004t)

125 - 70 = 380e^(-0.1004t)

55/380 = e^(-0.1004t)

In (55/380) = -0.1004t

-0.1004t = -1.9328

t = 1.9328/0.1018

t ≈ 19 minutes

Thus, it will get to a temperature of 125°F at 9:19 PM

B) Thus, at temperature of 150°F, we can find the time from;

150 = 70 + (450 - 70)e^(-0.1004t)

150 - 70 = 380e^(-0.1004t)

80/380 = e^(-0.1004t)

In (80/380) = -0.1004t

-0.1004t = -1.5581

t = 1.5581/0.1004

t ≈ 16 minutes.

Thus, it will get to a temperature of 150°F at 9:16 PM

C) As time passes which means as it approaches to infinity, it means that e^(-kt) gets to 1.

Thus,we have;

T(t) = T_r + (T_i - T_r)

T_r will cancel out to give;

T(t) = T_i

Thus, as time passes temperature approaches the initial temperature of 450°F

6 0
3 years ago
The price of pair of shoes is $63.20. The sales tax rate is 4.5 percent. How much sales tax would you pay if you bought these sh
olga nikolaevna [1]
The answer to the problem is as follows:

We can convert 4.5% into a decimal form by moving the decimal to the left two places. This becomes: .045

<span>63.20 x .045 = $2.84

</span>I hope my answer has come to your help. God bless and have a nice day ahead!

4 0
3 years ago
Read 2 more answers
A point is reflected over the y-axis, but the x-coordinate does not change. What is the location of the point? (0, 3) (-1, 0) (1
Wewaii [24]

Answer:

(0, 3)

Step-by-step explanation:

Any point on the y-axis doesn't move when reflected across the y-axis. The x-coordinate must be zero. The only choice with that x-coordinate is (0, 3).

5 0
3 years ago
Read 2 more answers
Standard from 0.000000017
Marina CMI [18]

Answer:

1.7 × 10^-8

Step-by-step explanation:

hope this helps with the work

4 0
3 years ago
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