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2 years ago

Which are the best buys?ay 3 books for Rs 60 or 5 same books for Rs 90

Mathematics

2 answers:

kogti [31]2 years ago

8 0

Answer:

Sine 3 books are for 60-

60/3

Rs20 (per book)

and 5 books for Rs 90-

90/5

Rs18 (per book)

Thus we can save 2Rs and 5 books for Rs 90 iscthe best buy

Katen [24]2 years ago

8 0

5 for 90 because 90/5 is 18 and 60/3 is 20 so you save 2 . You need to know how much each individual book costs

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Ax-c=b solve for x<br> *show work

Makovka662 [10]

$ax-c=b\ \ \ |add\ c\ to\ both\ sides\\\\ax=b+c\ \ \ \ |divide\ both\ sides\ by\ a\\\\\boxed{x=\frac{b+c}{a}}$

4 0

2 years ago

PLZZZZ HELPPPP!!!!!! 12 POINTS!!!

Paha777 [63]

Plug in each pair into each system of inequalities. And see which one fits

4 0

3 years ago

Is there a answer to this

hodyreva [135]

Answer:

mean=71

Step-by-step explanation:

Mean x¯¯¯x¯

Median x˜x~

Mode

64, 83, 79, 38, 81, 90, 59, 93, 70, 73, 71, 51

Range

Minimum

Maximum

Count n

Sum

852

Quartiles

Quartiles:

Q1 --> 61.5

Q2 --> 72

Q3 --> 82

Interquartile

Range IQR

20.5

Outliers

none

5 0

2 years ago

Assume you have such a watch. if a minimum of 18.0% of the original tritium is needed to read the dial in dark places, for how m

laila [671]

Given that the half life of 3H is 12.3 years.

The amount of substance left of a radioactive substance with half life of $t_{ \frac{1}{2} }$ after t years is given by

$N(t)=N_0\left(\frac{1}{2} \right)^{ \frac{t}{t_{\frac{1}{2}} }$

Therefore, the number of years it will take for 18% of the original tritinum to remain is given by

$18 \% = 100 \% \left(\frac{1}{2} \right)^{ \frac{t}{12.3}} \\ \\ \Rightarrow\left(\frac{1}{2} \right)^{ \frac{t}{12.3}} =0.18 \\ \\ \Rightarrow\frac{t}{12.3}\ln\left(\frac{1}{2} \right)=\ln0.18 \\ \\ \Rightarrow\frac{t}{12.3}= \frac{\ln0.18}{\ln\left(\frac{1}{2} \right)} = \frac{-1.715}{-0.6931} =2.474\\ \\ \Rightarrow t=2.474(12.3)=30.4$

Therefore, the number of <span>years that the time could be read at night is 30.4 years.</span>

5 0

3 years ago

Pls help me with this and an explanation

SCORPION-xisa [38]

Answer:

The relationship in this equation is linear, but not proportional. If it was proportional, then replacing x with nx should give ny as the answer. Example:

y = 3x

Replace x with 2x.

y' = 3(2x) = 2(3x) = 2y

y' = 2y

This is proportional. But if you replace x with 2x in

y = 3x + 5,

you will not get 2y for y'. This case is not proportiona

5 0

1 year ago

Read 2 more answers

Which are the best buys?ay 3 books for Rs 60 or 5 same books for Rs 90​

Which are the best buys?ay 3 books for Rs 60 or 5 same books for Rs 90