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3 years ago

7

Ive never seen a question like this tbh

2 answers:

Vikki [24]3 years ago

6 0

The formula A=1/2bh is used to find the area of a triangle. You can find from the diagram that the base of this triangle is 9cm, and the height is 4cm. Plug those numbers into the area of a triangle formula.

A=1/2(9)(4)

Multiply to get 18 square cm, which is choice D.

bulgar [2K]3 years ago

4 0

Easiest question I have ever seen! :)
We know the formula of the area of a triangle
= $\frac{1}{2}$ ×base×height
The height given is 4 cm (we should take the perpendicular height)
And the base length is 8 cm
Simply, we just substitute the given numbers
= $\frac{1}{2}$ ×8×4
=18 cm²
The answer is D: 18 square m

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JulijaS [17]

Answer:

<h2><u><em>15</em></u></h2>

Step-by-step explanation:

what is the value of 10×+z=150

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3 years ago

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Fine the value of the x in the triangle shown below.

Sever21 [200]

Answer:

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Step-by-step explanation:

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4 years ago

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A manager at a local company asked his employees how many times they had given blood in the last year. The results of the survey

Lubov Fominskaja [6]

Answer:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

Step-by-step explanation:

For this case we have the following distribution given:

X 0 1 2 3 4 5 6

P(X) 0.3 0.25 0.2 0.12 0.07 0.04 0.02

For this case we need to find first the expected value given by:

$E(X) = \sum_{i=1}^n X_i P(X_I)$

And replacing we got:

$E(X)= 0*0.3 +1*0.25 +2*0.2 +3*0.12 +4*0.07+ 5*0.04 +6*0.02=1.61$

Now we can find the second moment given by:

$E(X^2) =\sum_{i=1}^n X^2_i P(X_i)$

And replacing we got:

$E(X^2)= 0^2*0.3 +1^2*0.25 +2^2*0.2 +3^2*0.12 +4^2*0.07+ 5^2*0.04 +6^2*0.02=4.97$

And the variance would be given by:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

8 0

4 years ago