Mathematics

Factoring quadratics

I have two problems that I need help with: 1. -28y^2+7t^2 2. 8a^4+27ab^3 Thanks :)-1. -28y^2 + 7t^2 common factor of 7 7(t^2 - 4y^2) difference of two squares... 7(t + 2y)(t - 2y) check 2. 8a^

How do you solve this? lx^2+x-1l=1

lx^2+x-1l=1 um.... I cant figure out how to solve this problem if someone could show me how to do it step by step I would be grateful. Thanks-If | A | = C, then A=C or A= -C so, | X^2 + X - 1 | = 1

(easy 10 pts.) What is the integral of

1 / ((e^x)((e^x)+1) dx Please show complete solution...-∫dx/[e^(x)(e^(x) + 1)] ∫e^(-x) dx - ∫dx/(e^(x) + 1) -e^(-x) - ∫dx + ∫e^(x)/((e^(x) + 1)) dx -e^(-x) - x + ln(e^(x) + 1) + C-Note that 1/(e^x

How long will it take them to assemble the bookcase if they work together

Robert needs 40 minutes to assemble a bookcase.Paul needs 20 minutes to assemble the same bookcase.-Word Problems are normally set up using reciprocals. x = time working together. 1/40 + 1/20 = 1/x n

How much 10%alcohol solution be mixed w/ 14ounces of 18% solution to get a 12% solution

.1x +.18(14) = .12(14+x) OK, we have an unknown amount of 10% solution, mixed with 14 ounces of 18% to give us 12% solution in the amount of the 14 ounces plus what we added. x=42 So we must add 42

Word problem...(mixtures) Help please

Almonds 3.50$ a pound Cashews 9.00$ a pound You wan to make a mixture of almonds and cashews that consists of 60 pounds of almonds. The mixture will cost $7.50 per pound. Without varying prices how ma

Gaussian Elimination with back substitution for y'all

If you have specific questions about Gauss-Jordan elimination then ask them. I can solve this for you all day long and it wont help you learn and given how irritating it is to write matrices on yahoo

How would I do this?..

1. 3 logb(2) x=12 2. 3+4 logb(x) 4=5-1.3 log(base 2) x =12log (base 2) x^3 = 12Taking anti-log x^3 = 2^12 = (2^4)^3taking cube rootx =2^4=16 Hence x =16................Ans 2.3+4(log base x) 4 =54 (l

Scientific Notation... help please!

How do I convert 0.56 x 10^-2 into decimal form? I am wondering if I count the zero in front of the decimal when moving spaces over.-Well, first things first: That notation is wrong. Proper notation

Under ideal conditions a certain bacteria population is known to double every two hours.

Suppose there are initially 50 bacteria. (a) What is the size of the population after 6 hours? (b) What is the size of the population after t hours? (c) What is the size of the population after 11

How do you find f prime of 2 if f(x) = 4x^2 - 3x

Use the power rule first. Remember, in the power rule, you multiply the coefficient by the exponent, and then subtract one from the exponent. Also remember that x^0 = 1 so -3x will just become -3 beca

Rewrite with rational exponents

(√6mn)^5 solve: √2y+1=7 y= multiply (4+ √3)(4- √3) These are the only 3 that im stuck on out of 24 please help :0)-√6 means 6 to the 1/2 power and 6^5/2 power means the square root of 6^5. When

(a+b+c+d) (a+b) ? simplfy

(a+b+c+d) (a+b) i tried to do this but think its wrong. a(a+b) + b(a+b) + c(a+b) + c(a+b) + d(a+b) a^2 +ab^2 +ab + bd + ac + bc + ad +bd the answer is a^2 +b^2 +2ab + ac +ad .. how do you getthis an

A car dealer will sell you a used car for $8,514 with $514 down and payments of $153.18 per month for 60 month

A car dealer will sell you a used car for $8,514 with $514 down and payments of $153.18 per month for 60 months. What is the APR?-Present value = $8,000 ($8,514 - $514 down payment) Term = 60 months P

Some chemistry/math questions

1) how many cm (cubed/to the third) are there in one liter of water?2) how many mg are in one L (liter)?3) how many liters are in one gallon?4) i dont honestly know what its asking but heres the quest