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3 years ago

8

What is 3a squared add 7 a

1 answer:

vfiekz [6]3 years ago

3 0

The answer is: " 9a² + 7a " .
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Note: (3a)² + 7a = (3a)*(3a) + 7a = 9a² + 7a .
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What is the smallest and largest perimeter of a polygon with an area of 20?

DENIUS [597]

Answer:

The polygon with the smallest perimeter is the megagon

The polygon with the largest perimeter is the triangle

Step-by-step explanation:

An equilateral triangle with area = 20 has

0.5× a²×sin60 = 20

a= 6.796

Hence, perimeter = 20.39

A square of area 20 has perimeter= 4×√20 = 17.9

A regular pentagon of area = 20 has perimeter = 3.41 × 5 = 17.05

Hence as the number of sides is increasing, the ratio of the Area to the Perimeter also increases

Therefore, a triangle has the largest perimeter with an area of 20 while a megagon with a million sides has the smallest perimeter with an area of 20.

4 0

3 years ago

Tony is having a cookout and has to

Shalnov [3]

2 packages, he has $5 left so he can only buy 2.

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3 years ago

What does the expression 0.65d represent

castortr0y [4]

Answer:

decrease by 35%

Step-by-step explanation:

0.65 is only 65% of a whole number, so it decreases the original number by 35%

4 0

3 years ago

Read 2 more answers

Help please this is due I don’t understand <br> !!!!!

Dmitrij [34]

Answer:

B

Lemme explain rq.

If a number has a fractional exponent, that bottom part of the fraction goes the to root side when it is turned into a root.

Step-by-step explanation:

For example, 4 to the power of 2/3 becomes cube root of 4 to the power of 2.

When an exponent to a number also has a power

For example:

4 to the power of 2 to the power of 3

$(4^{2} )^{3} = 4^{2 * 3}$

So B because B is the only one where the two powers are multiplied.

8 0

3 years ago

Given that x and y are positive integers and (x·2)+x(2^2)+(y·2^3)+(y·2^4)=42, what is the value of xy?

Alex_Xolod [135]

I am gonna try my best to explain this to you :)

Firstly what you need to do is simplify the equation

$(x*2)+x(2^2)+(y*2^3)+(y*2^4)=42\\2x+4x+8y+16y=42\\6x+24y=42$

Now it looks a little less complicated the next step is to isolate y, in order to do that we solve the equation for y

$6x+24y=42$

$24y=42-6x\\y=\frac{42-6x}{24}$ Simplify it $\frac{7-x}{4}$

Now substitute y for $\frac{7-x}{4}$

$6x+\frac{7-x}{4}=42\\4(6x)+7-x=42*4\\24x+7-x=168\\23x+7=168\\23x=168-7\\23x=161\\x=\frac{161}{23}\\x=7$

Now substitute x for 7 and solve for y

$6(7)+24y=42\\42+24y=42\\24y=42-42\\24y=0\\y=\frac{0}{42}\\y=0$

x=7 and y=0

Hope this helps :)

4 0

3 years ago