Mathematics

What is sum of all digits from 5 to 10

10+9+8+7+6+5=45 The answer is 45-the sum of 1 + 2 + 3 + 4 + .....+ n = (n)(n+1)/2 So 1+2+3....+10 = (10)(11)/2 = 55 but since you only want 5-10, we subtract the first 4. 1+2+3+4 = (4)(5)/2 = 10

Got my report card, doesn't say my average grade!

Hey, I got my report card yesterday, but our school board stopped putting our average grade on the report card. So, now Im a little frustrated because I wanted to know what it was :/ I was in grade

Who can help with algebra problem

Please fill in the missing values to complete the squareof these two problems.1) x^2+1.2x+ __ 2) x^2-32x+____-to complete the square, you take half of the b term and square it... 1) x^2 + 1.2x + .36

Explain how this is happening

y=8^(x^(1/x)) When a power is raised to a power, the powers get multiplied. So this should have been equal to y=8^1, or y=8. The graph of this is not even close to y=8; there are imaginary parts, cur

Quadratic equation help needed

to solve the quadratic equation 7x^2-2=3x, we can substitute values for a,b and c into the quadratic formula. which is the true statement A) a=7,b=-3,c=-2 B) a=7, b=-2,c=-3 C) a=7, b=3, c=-2 D) a=7,

Does the series converge or diverge

sum m=1 to infinity(3^M)*(M^3) / M! what test do i use?-A mixture of exponentials and factorials suggests the use of the Ratio Test, so use it. With a_M = (3^M * M^3)/M!, the Ratio Test yields: lim

Can someone tell me how to solve this system of equations

if 3x+2y=17 and 4x-5y=15, what is xy? I dont see anything obvious to isolate, like I have in the past, so I dont know what to do?-You can always use elimination. (as long as its linear :P) 3x+2y = 17

Help! Probability question

If you toss a coin three times, what is the probability that you get. 1. Heads,Tales,Heads 2. No Tails 3. Only one Tail Can you show the solution on how you did it?-Make a list of all possible events

How to computer f^1(x) using limit definition

For example, f(x)=x^2+x.... I dont understand how to do this when it does give you the x.... Thanks for the help!-________________________________ f(x) = x² + x f(x+h) = (x+h)² + (x+h) = x²+2hx+h² +

Abstract algebra help--irreducible polynomials

Find all irreducible polynomials of degree 3 in F_2[x]. Do I list all possible polynomials and then check them with some sort of formula??-You have the right idea; just make sure they have no linear

How do you calculate 67% from $560 dollars

Do .67 x 560. You get 375.2-67% = .67 If you multiply $560 * .67 = $375.20-Multiply 560 by 0.67, which equals 375.2-Change 67% into .67 and times that by 560 and subtract the answer from 560.-.67x560

Simplify the expression by using a double-angle formula or a half-angle formula.

a. ((2 tan (5degres))/(1-tan^2(5degres))) b. ((2 tan (5x))/(1-tan^2(5x)))-Do remember the formula: tan(2y) = 2tan(y) / (1 - tan^2 (y)) a) In this case, tan(y) = tan(5) (2 tan(5)) / (1 - tan^2 (5))

2 questions about parallel and perpendicular lines

Find a given that the line joining P(a, -3) to Q(4, -2) is parallel to line with gradient 1/3. Find t given that the line joining P(t, -2) to Q(5, t) is perpendicular to a line with slope -1/4-slope

How to integrate (x^4+3x^2-4x+5)/ (x-1)^2(x^2+1)

Partial Fraction Please be specific if possible.-I dont know if theres a better alternative way but it is possible and long by partial fraction Note that your numerator and denominator are both of d

Help with this math question pleeaaassee!!!

the height of the attic (triangle) is 18ft and the slope the slope is 3/4. what is the length of x? (its and equilateral triangle, and x is the left diagonal) A)20ft B)24ft C)30ft D)42ft thanks ahea