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2 years ago

A cell phone is on sale for $205 after a 20% off discount. What was the original price of the phone?

Mathematics

1 answer:

Leni [432]2 years ago

7 0

Answer:

256.25

Step-by-step explanation:

if you have a 20% discount then you are paying 80% if the original cost.

so 80% of the original price is 205

.80x = 205

x = 205/.80

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Two scientists are running experiments on the same type of bacteria in different control groups. The results are shown in the gr

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Answer:

B, "The graph of g(x) will eventually exceed the graph of f(x)."

Step-by-step explanation:

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2 years ago

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A calculator is required to obtain the final answer on this question. A solid metal sphere at room temperature 20oC is dropped i

yKpoI14uk [10]

Answer:

T = 47.1875°C

Step-by-step explanation:

Given:

Surrounding temp, Ts = 100°C

Initial Temperature ,T0= 20°C

Increase in temperature = 15°C

Final temperature, T = 20 + 15 = 35°C

Time, t = 9 seconds

Let's take Newton's law of cooling:

$T - Ts = (T_0 - Ts)e^k^t$

We'll solve for k

$35 - 100 = (20 - 100)e^9^k$

$-65 = (-80)e^9^k$

Divide both sides by -5

$13 = (16)e^9^k$

$9k = ln (\frac{13}{16})$

$k = \frac{1}{9} ln (\frac{13}{16})$

$k = -0.02307104053$

Let's now find the temperature of the ball after 18 seconds in boiling water.

Use the Newton's equation again:

$T - Ts = (T_0 - Ts)e^k^t$

$T - 100 = (20 - 100)e^-0.0^2^3^0^7^1^0^4^0^5^3^*^1^8$

$T - 100 = (-80)e^-0.0^2^3^0^7^1^0^4^0^5^3^*^1^8$

$T - 100= -52.8125$

$T = 100 - 52.8125$

T = 47.1875°C

Temperature of the ball after 18 seconds in boiling water is 47.1875°C

5 0

2 years ago

At a cookout, the ratio of hamburgers to veggie burgers is 12:5. If 30 veggie burgers were eaten, how many hamburgers were eaten

Slav-nsk [51]

Answer:

Step-by-step explanation:

12x6=72

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2 years ago

What would the value of x be

nlexa [21]

Answer:

65°

Step-by-step explanation:

The sum of the interior angles of a quadrilateral is 360 degrees.

65+115+115=295

360-295=65

Answer: 65°

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Type 900 words in 15 minutes how many word per minute

rewona [7]

Answer:

60 words per minute

Step-by-step explanation:

"per" means "divided by" in this context. When you want "words per minute", it means you want the number of words divided by the corresponding number of minutes:

... (900 words)/(15 minutes) = 60 words/minute

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2 years ago