Please help. my grade in math is terrible all i want is help please.

Find the missing side lengths. Answers are in simplest radical form with the denominator rationalized

Roman55 [17]

Answer:

Option B.

Step-by-step explanation:

The given triangle is a right angle triangle.

In a right angle triangle,

$\tan \theta=\dfrac{Perpendicular}{Base}$

In the given triangle,

$\tan (45^{\circ})=\dfrac{v}{7}$

$1=\dfrac{v}{7}$

$7=v$

Using Pythagoras theorem, we get

$hypotenuse^2=Perpendicular^2+Base^2$

$u^2=v^2+7^2$

$u^2=7^2+7^2$

$u^2=2(7^2)$

Taking square root on both sides, we get

$u=\sqrt{2(7^2)}$

$u=7\sqrt{2}$

Therefore, the correct option is B.

6 0

3 years ago

Using π = 3.14, find the area of a circle with a radius of 4.2. Round your answer to the nearest hundredth. will give brainliest

xxMikexx [17]

Answer:

<h2>55.39 units ^2</h2>

Step-by-step explanation:

A=pi*r^2

A=3.14*4.2^2

A=3.14*17.64

A=55.3896

A≈55.39 units ^2

7 0

3 years ago

Read 2 more answers

If f(x) = x^3 find df/dx | x= -5

asambeis [7]

Answer:

75

Step-by-step explanation:

So we have:

$f(x)=x^3$

Take the derivative of the function. Use the power rule, which states that:

$\frac{d}{dx}(x^n)=nx^{n-1}$

Therefore:

$\frac{d}{dx}[f(x)]=\frac{d}{dx}[x^3]$

Use power rule:

$\frac{df}{dx}=3x^2$

Now, substitute in -5:

$3(-5)^2$

Square and multiply:

$=3(25)=75$

So our answer is 75.

This means that the slope of the line tangent to the point (-5,-125) on the graph x^3 is 75.

And we're done!

8 0

4 years ago

he lengths of a particular animal's pregnancies are approximately normally distributed, with mean muequals252 days and standar

Rashid [163]

Answer:

Step-by-step explanation:

Let X be the lengths of a particular animal's pregnancies

X is N(252, 20)

(a) What proportion of pregnancies lasts more than 262 days?

$P(X>262) = 0.3085$

(b) What proportion of pregnancies lasts between 227 and 257 days?

$P(227$

(c) What is the probability that a randomly selected pregnancy lasts no more than 237 days?

P(X<237) = 0.2266

(d) A "very preterm" baby is one whose gestation period is less than 202 days. Are very preterm babies unusual?

$P(X$

Yes very unusual since probability is very near to 0.

7 0

4 years ago

Read 2 more answers

9.<br><br><br>A. (3, 6)<br><br>B. (20, –4)<br><br>C. (10, –1)<br><br>D. (–1, 8)

crimeas [40]

Answer:

(10, –1)

Step-by-step explanation:

[1]XXXX3y=−12x+2

[2]XXXXy=−x+9

While it is not technically necessary, I find it easier to clear the fractions before actually beginning; so multiplying [1] by 2

[3]XXXX6y=−x+4

Substituting (from [2]) (−x+9) for y in [3]

[4]XXXX6(−x+9)=−x+4

Simplifying

[5]XXXX−6x+54=−x+4

[6]XXXX5x=50

[7]XXXXx=10

Substituting (from [7]) 10 for x in [2]

[8]XXXXy=−10+9=−1

7 0

3 years ago