3 years ago

Please help 20 points please helpppp I don’t understand

Mathematics

1 answer:

Elan Coil [88]3 years ago

5 0

Answer:

I think that its 58 degrees

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A distribution x is known to have a mean value of 5 and a standard deviation of 5. what is its mean square value (i.e., the expe

telo118 [61]

$\mathbb V(X)=\mathbb E(X^2)-\mathbb E(X)^2$
$\implies 5^2=\mathbb E(X^2)-5^2$
$\implies\mathbb E(X^2)=50$

8 0

3 years ago

A person invested $6,000, some at 7% and the rest at 5%. The income from the 7% investment is equal to the income from the 5% in

8090 [49]

Answer:

The person invested $3500 at 7% and $2500 at 5%

Step-by-step explanation:

We can say that $0,07x+0,05x=6000$ because the investment is equal both in one as in another, where x is the income from the investment.

Solving the equation we have:

$0,12x=6000\\x=50000$

Then to get the incomes:

At 7%: $I=0.07*50000\\I=$3500$

And at 5%: $I=0.05*50000\\I=$2500$

Finally we can demonstrate the answer because the income at 7% + income at 5% are 3500+2500=$6000

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3 years ago

Let the shortest side of a triangle be x. The longest side of a triangle is six

siniylev [52]

I think you guys are using a^2 + b^2 = c^2

the equation would be

x^2 + 2x^2 = 6^2

3 0

3 years ago

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Which equation has the same y-intercept as y=4x-3?

Masja [62]

The first one is D. Y=-3+8x
The second one is G. -3/2x=y+2

3 0

3 years ago

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5. Find the solutions of x^2 – X-30 = 0.<br><br> please show work on how to do it

erica [24]

Answer:

x=6, x= -5

Step-by-step explanation:

Factor the equation

x^2 - x - 30 = 0 ----> (x-6)(x+5)=0

Next find the solution by setting those in the paranthesis equal to zero.

x-6=0 ----> x= 6

x+5=0 ----> x= -5

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3 years ago

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