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3 years ago

Zara bought 150 pairs of shoes

Mathematics

2 answers:

Bad White [126]3 years ago

6 0

Zara profited 1750 dollars

Leto [7]3 years ago

3 0

required profit=$1750

cp=$6000

sp1=100×$50=$5000

sp of remaining sp2={150-100}×$55=50×55=$2750

profit={sp1+sp2}-cp=$5000+$2750-$6000=$1750

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can two different numbers have the same absolute value? if yes, give an example. if no, explain why not.

jekas [21]

Yes. Absolute values are always positive, so for example:

the absolute value of 1 is 1, and the absolute value of -1 is also 1

or the absolute value of 7 is 7, and the absolute value of -7 is also 7

and so on!

4 0

3 years ago

A car travels at an average speed of 56 miles per hour . how many miles does it travel in 4 hours and 15 minutes

Natali [406]

56 miles per hour

15 minutes is 1/4 of an hour

1/4 = 0.25

so 56 x 4.25 = 238 miles

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3 years ago

90% of 250 please help

Anna007 [38]

I agree the answer is 225 and you can also use the calculator too.

6 0

3 years ago

I just need answer no explanation needed

Vilka [71]

Answer:

Wait an answer fro what ..?

confusion lol .

Step-by-step explanation:

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3 years ago

My Notes OAsk Your Tea The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t an

Papessa [141]

Answer:

10.96 hours will take for 85% of the lead to decay.

Step-by-step explanation:

Suppose A represents the amount of Pb-209 at time t,

According to the question,

$\frac{dA}{dt}\propto A$

$\implies \frac{dA}{dt}=kA$

$\int \frac{dA}{A}=\int kdt$

$ln|A|=kt+C_1$

$A=e^{kt+C_1}$

$A=e^{C_1} e^{kt}$

$\implies A=C e^{kt}$

Let $A_0$ be the initial amount,

$A_0=C e^{0} = C$

$\implies A=A_0 e^{kt}$

Since, the half-life of 3.3 hours.

$\implies \frac{A_0}{2}=A_0 e^{3.3k}\implies e^{3.3k}=0.5\implies k=-0.21004$

$\implies A=A_0 e^{-0.21004t}$

Here, $A_0=1\text{ gram}$

$A=(100-85)\% \text{ of }A_0=15\%\text{ of }A_0=0.15A_0$

By substituting the values,

$0.15A_0=A_0 e^{-0.21004t}$

$0.15=e^{-0.21004t}$

$\implies t\approx 10.96\text{ hour}$

6 0

3 years ago