geno3141

V = I · R

If the resistances are in series add them:  R  = R1 + R2

However, if the resistances are in parallel, add their reciprocals:  R  =  1/R1 + 1/R2

So, either:  4.6  =  0.62(2.1 + R2)  

--->         7.419 =  2.1 + R2

--->             5.3  =  R2

or         4.6  =  0.62(1/2.1 + 1/R2)

--->   7.419 =  1/2.1 + 1/R2

--->   6.943  =  1/R2

--->   6.943R2  =  1

--->   R2  =  0.144

To find the total number of toothpicks needed, multiply the number of toothpicks given to each student times the number of students:

N  =  t · s

Celsius and Fahrenheit are both measured in degrees.

If you want to change from Fahrenheit to Celsius, use the formula:  C  =  (5/9)(F - 32).

If you wnat to change from Celsius to Fahrenheit, use the formula:  F  =  (9/5)C + 32.

I have difficulty understanding the question.

If your question is: If there is $60 tax on $200, how much tax would be on $8?

then, assuming the same tax rate, set up a proportion:  60/200 = x/8

                                                     cross-multiply:                480  =  200x

                                                      divide by 200:                $2.4  =  x

If your question is: If there is $60 tax on $200, what would have a tax of $8?

then, assuming the same tax rate, set up a proportion:  60/200 = 8/x

                                                     cross-multiply:              1600  =  60x

                                                      divide by 200:           $26.67  =  x

Speak softly and don't scare it with a sharp knife.

Multiply them together to get the answer.

Anonymous has the correct answer.

To emphasize why his/her answer is correct:

To factor this:

Since the last term is negative, it must factor into one positive term and one negative term and the middle term is found by subracting the those two terms.

Since the middle term is positive, the positive term must be larger than the negative term.

So, the question becomes, what two numbers, when multiplied together give you 18, and when you subtract one from the other, give you 7?

These are 9 and 2, and since the middle term is positive, the 9 must be positive and the 2 must be negative, so the factors are:  (x + 9)(x - 2).

I must be quite stupid, because I don't know what 'stupied' is.

My suggestion is to just enter that data into a calculator ...

Is the expression 'e-11' in the denominator and does it represent 'e^-11'?

Also, is the final '1/3' a multiplication by 1/3, or is it an exponent?