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4 years ago

10

PLEASE HELP FAST FOR 3 QUESTIONS 30 POINTS AVAILABLE!!!

1 answer:

mylen [45]4 years ago

4 0

Answer:

Hmm for the 4th question i think its 36.4

and 5th is interpolation

hard to read number 6 btw sense its not focused

hope i helped

branliest answer pls

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I don’t get this please help ASAP

jek_recluse [69]

Answer:

AE = 70

Step-by-step explanation:

Given that ACE is a triangle and B , D , F are mid-points of AC, CE, AE respectively.

⇒ BF, FD, BD are mid-segments.

Mid-segment is a line segment joining mid points of two sides of a triangle,

And it as two properties :

1) mid-segment is always parallel to the third side

2) mid-segment is half in length of the third side

⇒ Here, BD is the mid-segment and is parallel to third side AE

And also BD is half of AE

⇒ AE = 2×BD = 2×35

⇒ AE = 70.

3 0

3 years ago

An open rectangular box with volume 9 m3 has a square base. Express the surface area SA of the box as a function of the length o

IgorLugansk [536]

Answer:

The surface area of the box as a function of the length of a side of the base is $S=x^2+\frac{36}{x}$ .

Step-by-step explanation:

Let $x$ be the length side of the square base and $y$ be the height of the box.

According with the diagram the volume of a rectangular box with a square base is given by

$V=x^2\cdot y$

and we know that its value is 9 $m^3$ .

The surface area is given by

S = (Area of Base) + 4(Area of a Vertical Side)

$S=x^2+4\cdot x\cdot y$

From the volume formula we can solve for $y$

$9=x^2\cdot y\\y=\frac{9}{x^2}$

and substitute into the surface area formula

$S=x^2+4\cdot x\cdot \frac{9}{x^2} \\S=x^2+\frac{36}{x}$

4 0

3 years ago

If the measures of the area and circumference of a circle have the same numerical value, what is the radius of the circle and wh

Daniel [21]

The radius is part of the circle's formula to find the area and circumference of a circle. It is given when you divide the diameter with 2. For example if the diameter of a circle is 4 then the radius would be 2 because 4/2 is 2

5 0

3 years ago

Rewrite with only sin x and cos x.

Nikitich [7]

Answer:

correct <em>Answer is A,</em> $cos3x=cosx -4sinx^{2}\times cosx$

Step-by-step explanation:

Theory:

$cos(A+B)=cosA\times cosB-sinA \times$ sinB.

$cos(A-B)=cosA\times cosB+sinA \times$ sinB.

$sin(A+B)=sinA\times cosB+cosA \times$ sinB

$sin(A-B)=sinA\times cosB-cosA \times$ sinB

By using above formula, we write as,

$cos(2x)=cos(x+x)= cosx\times cosx-sinx\times sinx.$

$cos2x=cosx^{2} - sinx^{2}$

Also, $sin2x=sin(x+x)=sinx\times cosx+cosx\times sinx$

$sin2x=2sinx\times cosx$

Now,

$cos(3x)=cos(2x+x)=cos2x\times cosx-sin2x\timessinx$

$cos3x={cosx^{2} - sinx^{2}\times cosx}-{2sinx\times cosx\times sinx}$

$cos3x= {cosx^{3} - sinx^{2}\times cosx} - {2sinx^{2}\times cosx}$

$cos3x= cosx^{3} - 3sinx^{2}\times cosx$

$cos3x= cosx^{2}\times cosx -3sinx^{2}\times cosx$

$cos3x= (1-sinx^{2})\times cosx -3sinx^{2}\times cosx$

$cos3x= (cosx -sinx^{2}\times cosx) -3sinx^{2}\times cosx$

$cos3x=cosx -4sinx^{2}\times cosx$

thus, correct Answer is A<em>,</em> $cos3x=cosx -4sinx^{2}\times cosx$

7 0

4 years ago

Susan’s red notebook cover is 20 centimeters by 30 centimeters. She has a sticker for each letter in her name. Each sticker is a

alisha [4.7K]

Answer:

Find the surface area of her notebook.

30 + 30 + 20 + 20 = 100

Now find the surface area of the square stickers.

2 + 2 + 2 + 2 = 8

So this is the surface area of one square, now multiply it by 8.

8 * 7 = 56

This is the surface area of all the stickers, now subtract it to the surface area of the notebook:

100 - 56 = 44

So 44 centimeters of the notebook cover will still be showing.

Step-by-step explanation:

8 0

3 years ago