Please help me on my homework. Math question related to scientific form.?

Question

okay i did it but I'm not sure its right so can you help me by telling my ur answer and maybe how you got it?

A mature halibut may lay as many as 25 million eggs, but only 0.00035% of the offspring survive to the age of 3 years. Use scientific form to approximate the number of offspring form.

i got 35 x 10 to the power of -2. AM i wrong? =/

Answer 1

No that's wrong.It's 35x10 to the power of -5.(could be wrong though)

Answer 2

25 million is 2.5x 10 to the 7

.00035% is 3.5x10 to the negative 6

multiply

8.75x10 to the 1

Answer 3

no.  it's approx. 87

25,000,000 times 0.00035% = 87.5

check it just in case :)

Answer 4

Convert % into full number form

         0.00035%  / 100 >>  0.0000035

now multiply

         2.5 EE 07  x  3.5 EE -6

that's

           2.5 x 3.5 EE 01   >> 8.75 EE 01

or

           87.5 in non EEk speak

Answer 5

no i don't think so

i got the same answer

your back to school already that sucks

i don't wana go back

Answer 6

Generally, with scientific notation, you want to have only one digit in front of the decimal place.   Either way, your answer is incorrect.  It should be:

3.5 x 10 to the power of -4

It is easy to figure this out, I'll show you.  For every negative power, you move the original number to the right, and for every positive power, you move it to the left.  So, if you start out with:

3.5

you move it over until it looks like the number you're aiming for.

1)   0.35

2)   0.035

3)   0.0035

and finally,

4)   0.00035

So you get 3.5 x 10^-4

The percentage sign means you have to move it two more places to the right.  100% of a pie means you have just 1 pie, (100/100)=1

3.5 x 10^-4 divided by 100 equals 3.5 x 10^-6

Now, when I first read this problem, I thought you were supposed to multiply the percentage by 25 million eggs to get the number of offspring, not just the percentage.

25 million is equal to 25 x 10 to the 6th power.  

This is also equal to 2.5 x 10 to the 7th.

Now multiply the two answers together:

2.5*10^7 x 3.5*10^-6

This is cool, because now it's easy to find the answer.

2.5 x 3.5 = 8.75

7 + -6 = 1

So your answer is:

8.75 times 10 to the power of 1.  This is just equal to 8.75 times 10, which is equal to:

87.5

Have fun :/   Email me if you need help.

Answer 7

omg i hate math!  

Answer 8

when you write scientific form, your first number has to have a decimal after one number (ex.: 5.3, 0.2, 6.54, etc.)

3.5 x 10^ -7 = 0.0000035 = 0.00035%

25,000,000 x 0.00035% = 87.5

                                           = 8.75x10^1

Answer 9

25 000 000 * 0.000355%

or   ""         * 0.00000355

=  88.75