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2 years ago

HELP MEEE i can't answer this HARD PROBLEM

Mathematics

2 answers:

Stels [109]2 years ago

6 0

Answer: c 84 50 give me brainliest please

Step-by-step explanation:

Elina [12.6K]2 years ago

6 0

im going to go with A

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2. Exercise 18, 19 Page 188. Determine if the following statements are true. If a statement is true, give a proof from the defin

Roman55 [17]

Answer:

a. true b. true

Step-by-step explanation:

(a) If r and s are rational numbers, then (r+s)/2 is rational.

true

rational numbers can be expresed as fractions

let be r=a/b and s=c/d being a,b,c,d integer numbers

$\frac{r+s}{2} =\frac{\frac{a}{b}+\frac{c}{d} }{2} =\frac{\frac{da+bc}{bd} }{2} =\frac{da+bc}{2bd}$

d.a=e is an integer number because it's the product of two integers

b.c=f is an integer number because it's the product of two integers

e+f=g is an integer number because it's the sum of two integers

b.d=h is an integer number because it's the product of two integers

2.h=i is an integer number because it's the product of two integers

g/i=j is an integer number because it's the quotient of two integers

then

$\frac{r+s}{2} =\frac{\frac{a}{b}+\frac{c}{d} }{2} =\frac{\frac{da+bc}{bd} }{2} =\frac{da+bc}{2bd}=\frac{e+f}{2h} =\frac{g}{i} =j$

(b) For all real numbers a and b, if a

true

$a < (a+b)/2 < b$

$2a < (a+b) < 2b$

lets analyze 2a < (a+b)

$2a < (a+b) \\2a-a < (a+b)-a\\a < b$

then 2a < (a+b) is true

lets analyze (a+b) < 2b

$(a+b) < 2b\\(a+b)-b < 2b-b\\a< b$

then (a+b) < 2b is true

7 0

3 years ago

Read 2 more answers

-2x + y = 11 -7x - y - 25

Nostrana [21]

I think it’s is this answer

8 0

2 years ago

in a right triangle the acute angles measure x+15 and 2x degrees what is the measure of the larger acute angle of the triangle

Akimi4 [234]

So, x+15 + 2x = 90 
Therefore 3x = 90 - 15 = 75 
and so x=25. 

So the smaller angles are x+15 = 40 degrees and 2x=50 degrees. 
So the larger one is 50 degrees.

5 0

2 years ago

Read 2 more answers

Suppose that the middle 68% of speeding ticket fines on a highway fall between 93.18 and 118. Give an approximate estimate of th

Anton [14]

Answer:

The approximate estimate of the standard deviation of the speeding ticket fines is of 12.41.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

Approximately 95% of the measures are within 2 standard deviations of the mean.

Approximately 99.7% of the measures are within 3 standard deviations of the mean.

Middle 68% of speeding ticket fines on a highway fall between 93.18 and 118.

This means that 93.18 is one standard deviation below the mean and 118 is one standard deviation above the mean. That is, the difference between 118 and 93.18 is worth two standard deviations. So

$2s = 118 - 93.18$