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2 years ago

It costs $6.45 to buy 5 songs on I-tunes. How much does it cost to buy 20 songs?

Mathematics

1 answer:

babunello [35]2 years ago

5 0

Answer:$25.80

Step-by-step explanation:

6.45/5 = 1.29

1.29 x 20 =25.80

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Ajay bought a fan and a heater for rs 4000. He sold the fan at a profit of a 25% and the heater at a loss of 5%. If he gained 7%

Alborosie

Answer: Heater -Rs 2400; Fan- Rs 1600

Step-by-step explanation:

Given

Ajay bought a fan and a heater for Rs 4000

Suppose the price of fan is x and that of heater is 4000-x

Profit on the fan is $0.25x$

Loss on heater is $0.05\times (4000-x)$

Total profit is 7% i.e. $0.07\times 4000$

$\therefore 0.07\times 4000=0.25x-0.05(4000-x)\\\Rightarrow 280=0.25x-200+0.05x\\\Rightarrow 480=0.3x\\\Rightarrow x=1600$

Thus, the price of heater is $4000-1600=Rs.\ 2400$

Price of fan is $Rs.\ 1600$

Price of heater is $Rs.\ 2400$

8 0

3 years ago

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

What's the slope of 2,3 and 9,4

prohojiy [21]

Slope 1/7 ; easiest way to remember is rise over run

7 0

3 years ago

What is the following simplified product? Assume x≥0. 2√8x^3(3√10x^4-x√5x^2)

natta225 [31]

i think the answer is A.

5 0

3 years ago

Please answer I need help

Goryan [66]

Answer:

Maybe 3 1/2 but they don't give enough information

8 0

3 years ago