Questions on Word Problems: Evaluation, Substitution answered by real tutors!

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Question 420661: Whats the sum of two numbers is 117 and their differnce is 9. what are the two numbers?
Click here to see answer by angelmidnight(6)

Question 421063: a wire is need to support a vertical pole 14 feet high. the cable will be anchored to a stake 10 feet from the base of the pole. how much cable is needed?
Click here to see answer by mananth(12270)

Question 421281: A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b)Neither will fail? (c) One or the other will fail? Show all steps.
Click here to see answer by sudhanshu_kmr(1152)

Question 421347: Solve. 8x -(2x +5) = 7
Click here to see answer by MathLover1(6627)

Question 421392: The population in India is 1.17 billion people and expected to double in 45 years. The population in China is 1.34 billion people and is expected to double in 67 years. If this continues, when will India's population be the same as China's?
Click here to see answer by stanbon(57327)

Question 421433: ((4x^2 - 16)/(2-x)). Again worked hard, I know the answer is -4(x + 2) but I am not getting the steps to that answer.

Click here to see answer by stanbon(57327)

Question 421433: ((4x^2 - 16)/(2-x)). Again worked hard, I know the answer is -4(x + 2) but I am not getting the steps to that answer.

Click here to see answer by algebrahouse.com(1079)

Question 421434: I am homeschooled and I have tried for hours to get the right steps to this problem but I can't get it right. My mom put in the correct answer for you.
((2x^2 - 10x)/ (x^2 +8x +16)) ((4x + 16)/ (x^2 - 25)) the answer is((8x/ (x +4) (x+5)) but again no matter how many times I try the steps are wrong.

Click here to see answer by stanbon(57327)

Question 422390: Determine without graphing whether each pair of lines is parallel,perpendicular,or neither y=2/3x+1 3y=2x-3 y=2x+5 2y-x=6
Find the point-slope equation for each line containing the given point and having the given slope(2,5),m=2 (-4,0),m=-1/2
Find the slope-intercept equation for each line containing the given pair of points (-2,5) and (-1,4)

Click here to see answer by solver91311(16877)

Question 422857: AN ICE CREAM SHOP HAS 16 DIFFERENT FLAVORS AND 4 DIFFERENT TOPPINGS. IF A REGULAR SUNDAE CONTAINS 2 SCOOPS OF ICE CREAM AND 1 TOPPING, HOW MANY DIFFERENT SUNDAES CAN BE CREATED?

IF U COULD HELP THAT WOULD BE GREAT!! THE ANSWER IS 544 BUT I DONT KNOW HOW YOU GET THAT ANSWER. :)
Click here to see answer by sudhanshu_kmr(1152)

Question 422934: If a board is 12 2/3 feet long is cut into 3 equal pieces. Whats it the length of each piece

Click here to see answer by stanbon(57327)

Question 422934: If a board is 12 2/3 feet long is cut into 3 equal pieces. Whats it the length of each piece

Click here to see answer by shree840(260)

Question 423861: What is the fundamental difference between even roots and odd roots?
Click here to see answer by MathLover1(6627)

Question 423911: 10+15=2x+21

Click here to see answer by linht117(37)

Question 424175: root:3:((-27y^36)/(1000))
Click here to see answer by MathLover1(6627)

Question 424231: Word Problems :
three times one nuber added to another is eighteen. Twice the first number minus the other number is twelve. Fid the numbers. I really need to learn how to set this up! Its very confusing. Thanks!
Click here to see answer by MichelleL(6)

Question 424590: Intensity of a Light Bulb The farther a person is
from a light bulb, the less intense its light is. The
equation approximates the intensity of light
from a 60-watt light bulb at a distance of d meters,
where I is measured in watts per square meter.
(Source: R. Weidner.)
(a) Find I for meters and interpret the result.
(b) The intensity of light from a 100-watt light bulb
is about Find an expression for the sum
of the intensities of light from a 100-watt bulb
and a 60-watt bulb.

Click here to see answer by richard1234(5390)

Question 424625: Simplify expression.
(2x^2)(yx^3)(2yx^3)
I've got an answer of 4x^8y^2. Is this answer correct?
Please show steps.
Click here to see answer by Alan3354(30993)

Question 424878: Glenn and Paula want to dig an irrigation channel for their garden. Together it takes them 1.8 hours to dig an appropriately sized irrigation channel. If Paula can dig the channel by herself in 2.2 hours, how long would it take Glenn to dig the channel by himself? Round to the nearest tenth, if necessary.
Click here to see answer by mananth(12270)

Question 425100: Place the digits 1, 2, 3, 7, and 8 in the following boxes so that the greatest product is obtained.

Click here to see answer by Alan3354(30993)

Question 425108: The sum of two numbers is 117 and they are in the ratio of 8 to 5. Find the two numbers.
Not sure on which method to use to solve this problem. This section is about Rational Expressions and Rational Equations.
Click here to see answer by Alan3354(30993)

Question 425102: can you please help me with this word problem?
you have a rectangular piece of wrapping paper whose perimeter is at most 20 inches. You want to use it to cover a cubical box of length of two inches. sketch the graph that shows the possible area of the paper. can you cover the box?
i really don't under stand where to start. I tried multiplying 2(inches) by 6(sides) and getting 12 but i don't get how to graph the area.
thank you in advance
izzy
Click here to see answer by stanbon(57327)

Question 425090: 1)You are designing a rain gutter made from a piece of sheet metal 1 foot by 5 feet. The gutter will be formed by turning up two sides. You want the gutter to have the greatest volume possible.
a.How much should you turn up?

b.What is the maximum volume?
Click here to see answer by ankor@dixie-net.com(15649)

Question 425253: please understand this Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. Did you reach 1 for an answer? You should have.

Click here to see answer by tinbar(128)

Question 425333: Jennifer's bakery sold half as many marble cakes as strawberry shortcakes. The price of a marble cakes is $6 and the price of a strawberry shortcake is $8.50. If the total amount of sales for these cakes was $391, what is the total number of each kind of cake sold? Please help?
Click here to see answer by stanbon(57327)

Question 425928: I have a probability problem. If someone can help me figure out the steps and answer, it would be great. Thank you!
problem:
If a mother has three bananas, two pears and two oranges, in how many different ways can she give the fruit to her daughter in one week, one piece of fruit per day?
Click here to see answer by Theo(3460)

Question 425935: hi am stuck on the cotangent formula for triangles
how do we get from number 1 to number 2
1. m{cot α-cotθ} = n{cot β + cot θ}
2. (m+n) cot θ = m cot α - n cot β
Click here to see answer by Theo(3460)

Question 426045: In solving the equation (x + 4)(x – 7) = -18, Eric stated that the solution would be
x + 4 = -18 => x = -22
or
(x – 7) = -18 => x = -11
However, at least one of these solutions fails to work when substituted back into the original equation. Why is that? Please help Eric to understand better; solve the problem yourself, and explain your reasoning.

Click here to see answer by ewatrrr(10682)

Question 426232: I NEED HELP ON FINDING THE SLOPE INTERCEPT FORM OF -2X+5Y=15
Click here to see answer by rfer(12657)

Question 426366: the slope is 1/3 and the y-intercept is -7

Click here to see answer by mananth(12270)

Question 426892: Where on the graph of 2x-6y=7 is the x-coordinate twice the y-coordinate?
Click here to see answer by sudhanshu_kmr(1152)

Question 426896: The difference of the digits of a 2-digit number is 5. If the digits are reversed, the new number is 7 greater than twice the original number. What is the units digit of the original number?
Click here to see answer by mananth(12270)

Question 426890: A boat took 1 hour and 50 minutes to go 55 miles downstream and 3 hours and 40 minutes to return. What is the rate of the current?
Click here to see answer by mananth(12270)

Question 426962: Kayli wants to build a parabolic bridge over a stream in her backyard. The
bridge must span a width of 200 cm. It must be at least 51 cm high where it is
30 cm from the bank on each side. How high will her bridge be?
I have tried many ways of figuring this question out. However, I was
unsuccessful.

Click here to see answer by lwsshak3(6494)

Question 426969: 5a+11+3a-7=-4 What does a equal?
Click here to see answer by ewatrrr(10682)

Question 427002: The complex expression 2/x/4/x can be written as?
Click here to see answer by richard1234(5390)

Question 427009: In the polynomial function f(x)=x^3-4x^2+6x-4, 2is a zero of the function. Name another zero of the function.
Click here to see answer by stanbon(57327)

Question 427006: Given the polynomial P(x)=2x^3-x^2-13x-6 and one of its factors:x+2.
How many zeros will there be. How would you know that?
Find the remaining factors of the polynomial.
please explain how you found the others.

Click here to see answer by richard1234(5390)

Question 427003: which of the following graph is the graph of the rational function y=4/2x-3?
Click here to see answer by Alan3354(30993)

Question 427151: Hi,
I have a statistic problem that give me some problem. I can seem t solve it. Problem:
Susan got 32 hits out of 191 times at bat, and Mario got 40 hits out of 226 times at bat. On average, who was the better hitter and why?
Click here to see answer by rfer(12657)

Question 427155: could you please help me with this problem.
this is for pre-calc.
You are a landscape artist designing a patio. The square patio floor is to be made from 128 cubic feet of concrete. The thickness of the floor is 15.5 feet less than each side length of the patio. What are the dimensions of the patio floor?
Click here to see answer by htmentor(789)

Question 427323: find all the REAL zeros of f(x) = 3x^4+11x^3+11x^2+x-2
Click here to see answer by stanbon(57327)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610