Questions on Algebra: Average answered by real tutors!

Tutors Answer Your Questions about Average (FREE)

Question 252679: The average (arithmetic mean) of a, b, c and d is n. If a + b = 150,
what is c + d ?
A) a + b + c B) a + b + n C) 4n – 150 D) 4n + 150 E) 4n – 100
Click here to see answer by palanisamy(496)

Question 250698: What are the zeros of p(x)=x^4+7x^3+9x^2-17x-20 solved algebraically?
Click here to see answer by drk(1908)

Question 252719: a 32 oz bottle of water costs $2.88. what is the cost per ounce?
Click here to see answer by richwmiller(9143)

Question 253002: What was the grade a student received on her first examination, if her other grades were 70, 80, and 90, and her average on the four examinations was 75?
(A) 60 (B) 75 (C) 85 (D) 90 (E) 100

Click here to see answer by palanisamy(496)

Question 253011: x+y =10 y+z = 15 x+z = 17

What is the average (arithmetic mean) of x, y and z ?
(A) 21 (B) 17 (C) 15 (D) 7 (E) It cannot be determined from the information given
Click here to see answer by hokies(65)

Question 253429: in this formula c= $5.25+ $2.50h c represents the toal charge for babysitting and h represents the number of hours the child is kept. Which is the amoubt joe should pay when his child is at the babysitting service for 4hrs?
Click here to see answer by Theo(3464)

Question 253369: Tom has taken 5 of the 8 equally weighted tests in his U.S. History class this semester, and he has an average score of exactly 78.0 points. How many points does he need to earn on the 6th test to bring his average score up to exactly 80.0 points?
Click here to see answer by richwmiller(9143)

Question 253486: The average score on 7 tests in Algebra was 79. What was the sum of all the scores?
Click here to see answer by richwmiller(9143)

Question 253488: The average of 6 integers is less than 30. If the average of the first 5 integers is 25, what is the greatest possible value of the 6th integer?
Click here to see answer by richwmiller(9143)

Question 253496: The average score of 10 players was 6.5. One player’s score was dropped, changing the average (arithmetic mean) of the remaining scores to 6.0. What score was dropped ?
(A) 4.5 (B) 5 (C) 10 (D) 11 (E) 54
Click here to see answer by richwmiller(9143)

Question 253845: The interior dimensions of a carton in the shape of a rectangular prism are
2 ft by 1ft by 1 1/2 feet.
How many boxes, each in the shape of a cube with 1-inch edges, will fit inside
the carton?
I think the answer is 36 cubes, but I want to make sure.
the volume = lxwxh, so the volume would be 3 cubic feet. Then I thought that
there would be 36 inches in 3 feet so maybe the answer was 36 cubes.
Click here to see answer by Theo(3464)

Question 253869: Study the terms in this trinomial.
28x(cubed)- 14x(squared) + 7x
Part A
Write the polynomial as the product of the GCF of all its terms and a polynomial.
I know that the GCF is 7x
I don't know if I should put my answer as
7x(4x squared - 2x + 1) or if I should eliminate the x on the outer part
of the parenthesis and put
7(4x cubed - 2x + 1

I'm sorry I don't know how to type the exponents without spelling it out.
I really want to get this one exactly right.

Click here to see answer by Alan3354(30993)

Question 253882: During her trip to Europe, Mary learned that 1 euro was equivalent to the value of 1.28 U.S. dollars.
Part A
Mary began her trip with $2,000 U.S. dollars. How many euros did Mary have?
Show your work.
2,000 divided by 1.28 = 1562
Answer ________1562 euros_____________ Is this answer correct?
Part B
After her trip, Mary had 740 euros left. What was the value in U.S. dollars?
Show your work.
740 X 1.28 = $947.20
Answer _________$947.20_______________
Do I have the answers right? Please let me know. Thank you

Click here to see answer by richwmiller(9143)

Question 254233: What is the average (arithmetic mean) of 8,7,7,5,3,2,and 2?
Click here to see answer by richwmiller(9143)

Question 254233: What is the average (arithmetic mean) of 8,7,7,5,3,2,and 2?
Click here to see answer by jim_thompson5910(28598)

Question 254233: What is the average (arithmetic mean) of 8,7,7,5,3,2,and 2?
Click here to see answer by Edwin McCravy(8909)

Question 254289: A circle has a radius of 5.1 meters. what is the area of the circle?
PLEASE ANWSER TODAY!!!
I have tried every way i can think of to anwser this question, but we had a substitute for a teacher today, and she was not very good at explaining things.
Thanks!
Click here to see answer by JimboP1977(308)

Question 254296: Find the area of a circle. Use 3.14 or 22/7
Diameter = 7ft
Answer = ?
PLEASE HELP!!!!!!
Click here to see answer by drk(1908)

Question 254296: Find the area of a circle. Use 3.14 or 22/7
Diameter = 7ft
Answer = ?
PLEASE HELP!!!!!!
Click here to see answer by richwmiller(9143)

Question 254530: you have 11 minutes to print 25 pages, how many minutes per page
Click here to see answer by JimboP1977(308)

Question 254545: What is the average of 3,8and 7
Click here to see answer by solver91311(16897)

Question 254545: What is the average of 3,8and 7
Click here to see answer by Alan3354(30993)

Question 255166: x2-25y2 . i need to factor this
hi

Click here to see answer by khadijashareef2009@hotmail.com(1)

Question 255302: 55 shrimps = 32 oz.
so how many shrimps (x) = 3 oz
Click here to see answer by CharlesG2(828)

Question 256015: what is the average of a+b+c+a? I want to know if i shal divide by 3 or 4
Click here to see answer by ptaylor(2048)

Question 256023: Tom has taken 5 of the 8 equally weighted tests in his U.S. History class this semester, and he has an average score of exactly 78.0 points. How many points does he need to earn on the 6th test to bring his average score up to exactly 80.0 points?
A. 90 B. 88 C. 82 D. 80 E. 79

Click here to see answer by drk(1908)

Question 256009: The average of 10 numbers a,b,c,d,…,i,j is 190. If “a” is replaced by “2a”, the
new average is 500. What is the value of “a”?
Click here to see answer by drk(1908)

Question 256105: Find the mean, median, and mode for the following groups of data: 5,8,6,3,5,4,3,6,1,9.
Click here to see answer by jim_thompson5910(28598)

Question 256860: ok my science 10 mark is about a 60%, if i get a 50% on my final that is worth 30% what is my new mark?
Click here to see answer by richwmiller(9143)

Question 256860: ok my science 10 mark is about a 60%, if i get a 50% on my final that is worth 30% what is my new mark?
Click here to see answer by drk(1908)

Question 256976: how much gas will it take to drive 298.8 miles, with a vehicle that travels 18 miles to the gallon

Click here to see answer by nanana(3)

Question 257033: Please help to make sure that I have done this correctly.
(It says to line the problem up vertically)
(3x^2-2x +5) + (x^2+2x-8) This is my answer: 4x^2 -3
(x^2+3x-5) - (-x^2-4x + 7) This is my answer: 2x^2 + 7x - 12
Hopefully, the answers are correct.
Thanks!
Click here to see answer by drk(1908)

Question 257291: This is kind of new for me to complete this type of problem, so I need some
help.

Factoring : Finding GCF/Reverse FOIL (Quadratic - 2 binomials)

8y^3 + 2y - 4y^2
Okay, this is my thinking.
I know that 2 is the greatest common factor.
I also know that y is in all three, but the lowest is just y^1, so
my greatest common factor is going to be 2y
I don't know how to explain this, but I'll try:
2y ( 4y^2 + 1 - 2y)
I put the greatest common factor on the outer parenthesis. Then
I figured out what numbers I need to reach to know what numbers I would
have to put inside the parenthesis.
This is a little confusing for me. Please help me if you can.
Click here to see answer by jim_thompson5910(28598)

Question 257442: The average of a and b is x. The average of b and x equals the average of a and (b + 1). Find a−b.
Click here to see answer by nerdybill(6962)

Question 257427: After ten tests, Bryan’s average test grade was 84. His teacher decided to drop each student’s lowest and highest test grade. This brought Bryan’s average up to 85. If his lowest test score (of the original 10 tests) was 24 points lower than his highest test, what was his highest test grade?
Click here to see answer by richwmiller(9143)

Question 257581: Before the final exam, a student has test scores of 72, 80, 65, 78, and 60. If the final exam count as one third of the final grade, what score must the student recieve in order to have 76%
Click here to see answer by ankor@dixie-net.com(15660)

Question 257708: I have three problems that are factoring
Factoring - Finding GCF
Reverse FOIL (Quadratic - 2 binomials)
8y^3 + 2y - 4y^2
for this one: I got the answer 2y (4y^2+1-2y) please tell me if this is right.

x^2 + 5x +6
for this one: I got the answer (x-1)(x+5) I'm not sure about this one.

y^2 - 4y -12
(y )(y ) This is as far as I got on this one. Please help.

Click here to see answer by richwmiller(9143)

Question 257745: how can i find the five number summary with 13 numbers?

Click here to see answer by richwmiller(9143)

Question 258015: I have to solve this by using elimination. I think my answer is wrong because when I entered my numbers in for the variables it didn't work out.

Elimation: x + y = 7
2x - y = 2
I ended up with (11, -4)
It doesn't completely work out when I do the checking.
Please let me know where I went wrong.

Click here to see answer by unlockmath(1603)

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, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330