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3 years ago

How many irrational numbers are there in the following list? I can't do this cause I don't have a calculator to help me.

Mathematics

1 answer:

snow_lady [41]3 years ago

7 0

The answer is 8 because you count all the numbers exept the fractions the fractions you count as one number

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Solve by substitution -3x-2y=5.5 x+3y=7.5

Naddika [18.5K]

$\bf \begin{cases} -3x-2y=5.5\\[-0.5em] \hrulefill\\ x+3y=7.5\\ \boxed{x}=7.5-3y \end{cases}~\hspace{5em}\stackrel{\textit{substituting \underline{x} in the 1st equation}}{-3\left( \boxed{7.5-3y} \right)-2y=5.5} \\\\\\ -22.5+9y-2y=5.5\implies -22.5+7y=5.5\implies 7y=28 \\\\\\ y=\cfrac{28}{7}\implies y=4 \\\\\\ \stackrel{\textit{substituting the found \underline{y} in the 2nd equation}}{x+3(4)=7.5\implies x+12=7.5}\implies x=-4.5 \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill (-4.5,4)~\hfill$

5 0

3 years ago

Please help me to simplify 7+(6-4p)-2

guapka [62]

7+(6-4p)-2 (distribute the 7)
42-28p-2 (simplify)
40-28p

8 0

4 years ago

20 points helpp!!! i need it to be ready soon:/

Shkiper50 [21]

Answer:

Q7) 25.5

Q8) 25

Q9) 10

Q10) 12.7

Q11) 34

Q12) 24

Step-by-step explanation:

Q7) c² = a² + b²

x² = 18² + 18²

x = √18² + 18²

x = 18√2 = 25.5

Q8) c² = a² + b²

x² = 20² + 15²

x = √20² + 15²

x = 25

Q9) c² = a² + b²

26² = 24² + x²

x = √26²-24²

x = 10

Q10) c² = a² + b²

x² = 9² + 9²

x = √9² - 9²

x = 9√2 = 12.7

Q11) c² = a² + b²

x² = 30² + 16²

x = √30² + 16²

x = 34

Q12) c² = a² + b²

25² = x² + 7²

x = √25² - 7²

x = 24

4 0

3 years ago

#1. What is 15% of 60?

Sati [7]

Answer:

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

What is −20÷45−20÷45 ? A. −25 B. −16 C− 1/16 D. − 1/25

stealth61 [152]

The answer is -25 i just took the test/quiz

7 0

4 years ago