I need help on 24 and 22! Does anyone get it?

Mathematics

1 answer:

kipiarov [429]3 years ago

8 0

For #22, you add the fractions in the parentheses first. Since they don’t have the same denominator, you find a common denominator by multiplying 3/4 by 3 and 5/3 by 4. This will give you 9/12 and 20/12. So you now add these two fractions together to get 29/12, which simplifies to 2 5/12. You now have -2/3 + 29/12. -2/3 can be changed to -8/12 by multiplying it by 4 so that they have common denominators. The equation is now -8/12 + 29/12 . Since -8/12 is a negative number, you subtract 8 from 29 to get 21/12. 21/12 can be simplified to 7/4 by diving it by 3. The answer for #22 is 7/4.

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A new restaurant with 134 seats is being planned. Studies show that 62% of the customers demand a smoke-free area. How many se

zzz [600]

Answer: 100

Step-by-step explanation:

Given : The total number of seats planned in new restaurant =134

The percentage of customers demand a smoke-free area = 62%

It can also be written as $62\%=\dfrac{62}{100}=0.62$

The mean of this binomial distribution will be :-

$\mu=np\\\\\mu=(134)(0.62)=83.08$

Standard deviation:-

$\sigma=\sqrt{np(1-p)}\\\\\Rightarrow\sigma=\sqrt{134(0.62)(0.38)}\approx5.6$

Now, the number of seats should be in the non-smoking area in order to be very sure of having enough seating there :-

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The booster club raised $102 in there car wash. They want to buy $18 soccer balls for the soccer team. Write and solve an inequa

sergey [27]

Answer:

X=5

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3 0

3 years ago

Need help on both of them

Vlad1618 [11]

7) Write the decimal number as a fraction
(over 1)
2.18 = 2.18 / 1

Multiplying by 1 to eliminate 3 decimal places
we multiply top and bottom by 3 10's

Numerator (N)
N = 2.18 × 10 × 10 × 10 = 2180
Denominator (D)
D = 1 × 10 × 10 × 10 = 1000

N / D = 2180 / 1000

Simplifying our fraction

= 2180/1000

= 109/50

= 2 9/50

8) $7 ^{-5} = \frac{1}{7^{5}}$