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dybincka [34]
4 years ago
9

SOMEONE HELP DO NOT UNDERSTAND

Mathematics
1 answer:
Leokris [45]4 years ago
4 0

Answer:

3/8

Step-by-step explanation:

There are 3 numbers less than 4 (1, 2, and 3), so the denominator would be 8 for the total number of possibilites and the numerator would be 3.

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What's 5 - the square root of x + 10 = the square root of 7 - x
Tcecarenko [31]
\bf 5-\sqrt{x+10}=\sqrt{7-x}\impliedby \textit{squaring both sides}
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(5-\sqrt{x+10})^2=(\sqrt{7-x})^2
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(5^2)-10\sqrt{x+10}+(x+10)=7-x
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35-10\sqrt{x+10}+x=7-x\implies 28-10\sqrt{x+10}+2x=0
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2x+28=10\sqrt{x+10}\implies x+14=5\sqrt{x+10}\impliedby 
\begin{array}{llll}
squaring\ both\\
sides\ again
\end{array}
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\bf (x^2)+28x+(14^2)=5^2(x+10)\implies x^2+28x+196=25x+250
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\begin{array}{lcclll}
x^2&+3x&-54&=0\\
&\uparrow &\uparrow \\
&-6+9&-6\cdot 9
\end{array} \implies (x+9)(x-6)=0\implies 
\begin{cases}
x+9=0\\
\boxed{x=-9}\\
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3 0
3 years ago
5. If John, travelling at a constant speed on a stretch of highway, covers 25 miles in 30
anzhelika [568]

Answer:

150 miles

Step-by-step explanation:

We can split 3 hours into six sections of 30 minutes, then multiply those six sections by the 25 miles. 6 times 25 equals 150

6 0
3 years ago
If g(x) = -8x+1. Find g(-2).
puteri [66]
-8*-2+1=16+1=17
g(-2)=17
7 0
3 years ago
Read 2 more answers
part b is: if the energy release of one earthquake is 10,000 times that of another, how much larger is the Richter scale reading
kotegsom [21]

You could use the information from part A to get B. I'm not sure if you want A or not, so I'll do it as well.

A

Eo = 10^4.4 Joules

E = 2 * 10^15

Formula

M = (2/3) log (E/Eo)

M = 2/3 * log (2 * 10^15/10^(4.4) )

M = 2/3 * log( 7.9621* 10^10)

M = 2/3 * 10.901

M = 7.26735 on the Richter scale. That is a huge amount of energy.

Part B

Suppose that you use Eo and your base. Eo is 10^4.4

Now the new earthquake is E = 10000 * Eo

So what you get now is M = (2/3)* Log(10000 * Eo / Eo )

The Eo's cancel out.

M = 2/3 * log(10000)

M = 2/3 of 4

M = 8/3

M = 2.6667 difference in the Richter Scale Reading. It is still an awful lot of energy.

What this tells you is that if the original reading was (say) 6 then the 10000 times bigger reading would 8.266667

Answer: M = 2.6667


8 0
3 years ago
Read 2 more answers
Which of the following numbers is written in scientific notation?
nata0808 [166]

Answer:

i think is b

Step-by-step explanation:

8 0
3 years ago
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