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Natali5045456 [20]
3 years ago
15

Junior's brother is 1 1/2

Mathematics
1 answer:
AlladinOne [14]3 years ago
6 0

Answer:

Step-by-step explanation:

1 1/5 of 1 1/2 meters  

= (1+1/5) x (1+1/2)  

= 1x1 + 1x1/2 + 1x1/5 + 1/5*1/2  

= 1 + 1/2 + 1/5 + 1/10  

= 1 + (1x5+1x2+1)/10  

= 1 8/10  

= 1 4/5 meters

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At a high school with 800 students, 80% of the students ride the school bus. if 20 students are selected randomly (without repla
Shtirlitz [24]

Answer:

0.9885   (98.85%)

Step-by-step explanation:

Since sample is less than 10% of the population, we can use binomial distribution to approximate the probability.

So we want to calculate P( X < 20 ).

We can calculate the probability of complement event P( X = 20 ).


Use binomial formula b(x; n, p) = C( n, x ) p^(x) (1-p)^(n-x)

b( 20; 20, 0.8 )

= C( 20, 20 ) (0.8)^(20) (0.2)^0

= (0.8)^20 ≈ 0.0115


So since P( X < 20 ) = 1 - P( X = 20 ), we have

P( X < 20 ) ≈ 1 - 0.0115 = 0.9885

5 0
4 years ago
Verify the identity: <br> (1-sinx)/cosx = cosx/(1+sinx)
Lisa [10]
For the answer to the question above,
<span>Let's work with the left-hand side 
We're going to times cosx/1-sinx by 1+sinx/1+sinx, you can do this because 1+sinx/1+sinx is equal to 1, so you aren't really changing anything. 

After you've times the top and bottom by 1+sinx, you get: 

cosx(1+sinx) / (1-sinx)(1+sinx) 

The denominator is a difference of squares, so you get 1-sin^2 x 

what you have now is 

cosx(1+sinx) / 1-sin^2x 

You know that 1-sin^2x is equal to cos^2x 

so know you have 

cosx(1+sinx) / cos^2x 

get rid of the cosx on top by simplifying and the cos^2x so that you're left with 

(1+sinx) / cos x 

Therefore cosx / 1- sinx = 1 + sinx / cos x</span>
4 0
3 years ago
7 kilometers - meters
TiliK225 [7]

Answer:

7000

Step-by-step explanation:

Because kilo means a thousand so for example 1kg=1000g

4 0
3 years ago
Solve 3t + 2 = 5t - 4
Talja [164]

Answer:

3

Step-by-step explanation:

3t + 2 = 5t - 4

3t - 5t = -4 - 2

-2t = -6

t = 6/2

t = 3

7 0
3 years ago
Read 2 more answers
Myra is evaluating the expression –31.7 + 4.5x, when x = 2.1. –31.7 + 4.5(2.1) –27.2(2.1) –57.12 What was Myra’s error?
Bingel [31]

Answer:

a negative and a positive

Step-by-step explanation:

always equal a negative

and she put x next to 31.7 when x was not meant to be there

3 0
4 years ago
Read 2 more answers
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