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3 years ago

How are the nervous systems of a flatworm and a fish different?

Mathematics

2 answers:

dexar [7]3 years ago

7 0

Answer:

3rd or first option

Step-by-step explanation:

MissTica3 years ago

5 0

Answer:

A flatworm has a very mild nervous system with pair nerve cords moving down each side. It has two single brains called ganglia, which are pure packages of nerves. ... Fish have extremely advanced nervous systems organized around a brain.

Step-by-step explanation: sCiEnCe RoCkS

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Jill is designing a picture frame for an art project. She plans to have a square piece of glass (x inches by x inches) in the ce

ra1l [238]

How would I at least start out those two problems?

It looks to me like you already did. Now just follow through with it.

If the length of each side of the frame's inner dimension (i.e. the glass) is x, and the length of each side of the frame's outer dimension is x^2 - 3, then the area of the frame is:

A = (outer dimension)^2 - (inner dimension)^2
27 = (x^2 - 3)^2 - (x)^2
27 = x^4 - 6x^2 + 9 - x^2
27 = x^4 - 7x^2 + 9 <----- This is where you got to already.
0 = x^4 - 7x^2 - 18
0 = (x^2 - 9)(x^2 + 2)

Therefore, either x^2 = 9 or x^2 = -2... and you know it can't be the latter.
Thus, x^2 = 9 and therefore x = 3. The glass is 3" on each side.

Each (outer) side of the frame is x^2 - 3 = 9 - 3 = 6"

4 0

3 years ago

Credit cards and charge cards differ in two important ways. One is the method of payment. What is the other difference?

ozzi

C. You have to pay interest on credit cards

Hope this helps

6 0

3 years ago

Racheal used a total of 5 1/6 gallons of gas while driving her car. Each hour she was driving, she used 5/9 gallons of gas. What

Andreyy89

Answer: The correct answer is: " 9.3 hours " .

_________________________________

Step-by-step explanation:

_________________________________

To calculate:

Let "gal" represent "gallons (of gas)" ;

Let "h" represent "hour(s)" ;

________________________________

5 $\frac{1}{6}$ gal * (  1 h  ) = ? h ;

( 5/9 gal ) ;

________________________________

Note: On the "left-hand side" of the equation;

The units of "gal" ["gallons"] — "cancel out" ;

→ {since: "gal/ gal = 1"} ;

____________________________

and we can rewrite our equation as:

_____________________________

( 5 $\frac{1}{6}$ )

________ hours ;

( 5/9 )

______________________________ ;

To solve:

_____________________________

5 1/6 ÷ (5/9) =

5 1/6 * (9/5) ;

____________________________

Note: Dividing by a fraction is the same as multiplying by that very fraction's reciprocal form.

__________________________

Now, let us convert "5 1/6" ; which is a "mixed fraction" ; into an

"Improper fraction" ;

__________________________

To do this, we can use the "MAD" method:

__________________________

M: Multiply the "denominator number" of the "fraction portion" [within the "mixed fraction"]—by the "whole number" [within the "mixed fraction" ; In this case: "6" , multiplied by "5" ; to get "30" ;

_________________

Then:

_________________

A: Add this obtained value; to the "numerator number" of the

"fraction portion" [within the "mixed fraction"] ;

In this case: "30" ; added to "1" ; to get 31:

__________________

Then:

D: Divide this number by the "denominator number" of the "fraction portion" [within the "mixed fraction"] ; but instead of solving for the quotient—write in the format of a fraction:

In this case: " $\frac{31}{6}$ " .

_________________________

Now, substitute this "improper fraction" into our original problem; and rewrite:

_________________________

" $\frac{31}{6} * \frac{9}{5}$ " hours;

_________________________

We can reduce the "9" to "3" ; and the "6" to "2" ;

_________________________

{Since "9/6 = 3/2" };

_________________________

And rewrite as:

_________________________

" $\frac{31}{2} * \frac{3}{5}$ " hours ;

_________________________

Note: " \frac{31}{2} * \frac{3}{5} " ;

_________________________

= " $\frac{(31*3)}{(2*5)} = \frac{93}{10}$ " ;

_________________________

= 93 ÷ 10 ;

_________________________

= 9.3 hours.

_________________________

The answer is: " 9.3 hours " .

_________________________

Hope this explanation is helpful!

Best of luck to you in your academic pursuits!

_________________________

3 0

3 years ago

Evaluate this exponential expression. 7 • (6 + 2)2 – 32 =

KIM [24]

The answer to this exponential expression is 439.

To solve this expression, we need to use pemdas (parenthesis, exponents, multiplication, division, addition, subtraction). That measn that we first have to do the parenthesis.

7 * (8)² - 3²

Now we have to do exponents.

7 * 64 - 9

Now we have to do the multiplication (because of the order of pemdas)

448 - 9

Finally, we do the subtraction

439. That means that the answer to this exponential expression is 439.

6 0

4 years ago

Read 2 more answers

Subjective probability has little use in the real world. True False

Snezhnost [94]

Answer:

false

Step-by-step explanation:

6 0

3 years ago