Mathematics

Smart With Equations?????11-13 please show work each for 5 ratings!

21. 7(x + 1) =2x + 57 22. 5(x - 2) = -30 23.1/7 (x +21)= -6 24. 2(x - 8) = -16 - 2 Please show work on each problem please just show me how you do it and ill get it :)! thanks for your time-21. 7(x+1

Help with variable cost

Help with variable cost? A Champagne manufacturer has a Break Even volume of 500,000 bottles per year. In 2009 they sold 750,000 bottles at €50 per bottle. The costs of running the vineyard for a year

Help explain this Alg. Problem

Please dont tell me the answer, because I already know it. I just need to know how to get to the answer, and Ive tried a couple times, but I just cant seem to get it. My answer ends up being something

Derivative of ln x / e^x

Derivative of ln x / e^x-y = ln x/e^x y = ln x * e^-x dy/dx = -ln x * e^ -x + (e^-x)/x dy/dx = e^ -x [-ln x + 1/x]-f ` (x) is given by Quotient Rule :- (e^x) (1/x) - (ln x) (e^x) -----------------

Find the arc length subtended by a central angle of 140deg with a radius of 1.6 feet

Could anyone please explain how to do this for me? I cannot figure out what any of it means :)-Arc Length = (1.6*2*pi)*(140/360) = 56pi/45 ft-s = rθ s = (1.6)(140)(π/180) s = (8/5)(7/9)π s = (56/45)π

Find the area of a circular sector with radius 3.4 inches and a central angle of 97deg

could anyone explain how to do this please, Cannot figure out what it means or how to do it.-97 / 360 = 0.269 ANSWER = (π * 3.4^2) * 0.269 = 9.79 square units-A = ½ θ r² A = ½ (97)(π/180) (3.4)² A =

Is this sudoku, how do i do this? [10 points if i get answer after an hour!]

http://oi51.tinypic.com/rr79e0.jpg Help D:-254316 316254 531642 462135 125463 643521-This is sudoku, but the smaller version. The usual version is 9X9. The objective of this game is to have the numbe

Please help me with this math problem, stuck!

Beth saved $5,425 in 5 months. Each month she saved twice as much as she had the month before. How much did Beth save the 2nd month?-x + 2x + 4x + 8x + 16x = 5425 31x =5425 x = $175 2x = 175 x 2 =$3

Domain of f(x)=cos x

all the real numbers

Trigonometry help pleasee

5. What is the smallest positive value for x where y = sin 2x reaches its maximum? A. π/4 B. π C. 3π/2 D. 2π E. 5π/2-find amplitude then period. Amp=1 period=pi quarter period=pi/4 Add pi/4 till

Expain to me how to solve

The equation 3x^4 - 4x^3 - 3x^2 = 0has three real solutions, A, B, and C, where A -First factor out common x^2: (3x^2 - 4x - 3)(x^2) = 0 Now realize that x=0 is a solution (x^2 is zero when x=0, and

Need help with a math problem!

The volume of a cone is given by the formula V = (1/3)r^2h. A cone has a volume of 16,038 cm^3 and radius of 27 cm. Find the height of the cone. A) 64 cm B) 66 cm C) 73 cm D) 69 cm-16038=1/3(27^2h)

Can someone pls help me figure out how to solve this math problem correctly please, someone that knows this...

The problem is... If you budgeted $78 per person for the wedding reception and you invited 165 guests to a wedding, how much money would you have spent? Please no sarcasm. Im thinking you times 78 wit

Need help with an algebra 2 problem

you want to install 3 ceiling lights in a row in your garage. each light = 3 ft long, garage = 27 ft long. distance between each light should be about the same. also the distance between the lights an

Range of f(x)= ln(x)

Note that ln(x) --> -infinity as x --> 0+ and ln(x) --> infinity as x --> infinity, so the range of ln(x) is all real numbers, or (-infinity, infinity). I hope this helps!