New!
Get regular updates about newly solved problems
via algebra.com's RSS system.
Recent problems solved by 'checkley75'
checkley75 answered: 3664 problems
Jump to solutions: 0..29 , 30..59 , 60..89 , 90..119 , 120..149 , 150..179 , 180..209 , 210..239 , 240..269 , 270..299 , 300..329 , 330..359 , 360..389 , 390..419 , 420..449 , 450..479 , 480..509 , 510..539 , 540..569 , 570..599 , 600..629 , 630..659 , 660..689 , 690..719 , 720..749 , 750..779 , 780..809 , 810..839 , 840..869 , 870..899 , 900..929 , 930..959 , 960..989 , 990..1019 , 1020..1049 , 1050..1079 , 1080..1109 , 1110..1139 , 1140..1169 , 1170..1199 , 1200..1229 , 1230..1259 , 1260..1289 , 1290..1319 , 1320..1349 , 1350..1379 , 1380..1409 , 1410..1439 , 1440..1469 , 1470..1499 , 1500..1529 , 1530..1559 , 1560..1589 , 1590..1619 , 1620..1649 , 1650..1679 , 1680..1709 , 1710..1739 , 1740..1769 , 1770..1799 , 1800..1829 , 1830..1859 , 1860..1889 , 1890..1919 , 1920..1949 , 1950..1979 , 1980..2009 , 2010..2039 , 2040..2069 , 2070..2099 , 2100..2129 , 2130..2159 , 2160..2189 , 2190..2219 , 2220..2249 , 2250..2279 , 2280..2309 , 2310..2339 , 2340..2369 , 2370..2399 , 2400..2429 , 2430..2459 , 2460..2489 , 2490..2519 , 2520..2549 , 2550..2579 , 2580..2609 , 2610..2639 , 2640..2669 , 2670..2699 , 2700..2729 , 2730..2759 , 2760..2789 , 2790..2819 , 2820..2849 , 2850..2879 , 2880..2909 , 2910..2939 , 2940..2969 , 2970..2999 , 3000..3029 , 3030..3059 , 3060..3089 , 3090..3119 , 3120..3149 , 3150..3179 , 3180..3209 , 3210..3239 , 3240..3269 , 3270..3299 , 3300..3329 , 3330..3359 , 3360..3389 , 3390..3419 , 3420..3449 , 3450..3479 , 3480..3509 , 3510..3539 , 3540..3569 , 3570..3599 , 3600..3629 , 3630..3659 , 3660..3689, >>NextExponents/105217: i have been working on the problem and not figuring out where they got there answer if someone could explain it to me...... (3x+7)exponent of 2 outside of ()
1 solutions
Answer 76580 by checkley75(3666)   on 2007-10-19 20:57:53 (Show Source):
You can put this solution on YOUR website!I DON'T TUTOR FOR PAY ON THIS SITE BUT I HAVE DONE SOME LOCAL TUTORING FOR A FEE. I'M NOT REALLY INTERESTED IN FEES BUT WILL HELP WHEN & WHEREVER I CAN.
KEEP USING THIS SITE AS IT HAS MANY SMARTER MATH PEOPLE THAN I AM.
GOOD LUCK!!!!!! : )
----------------------------------------------------------------------
(3X+7)^2=(3X+7)(3X+7) OR
3X+7
3X+7 NOW MULTIPLY USING THE FOIL PROCESS.
-------------------------
9X^2+21X+21X+49
9X^2+42X+49
FOIL STANDS FOR FIRST, OUTER, INNER & LAST.
THIS IS THE ORDER TO MULTIPLY SO YOU DON'T MISS NOR ANY ONE TERM TWICE.
FIRST=(3X+7)(3X+7) 3X*3X=9X^2
OUTER=(3X+7)(3X+7) 3X*7=21X
INNER=(3X+7)(3X+7) 7*3X=21X
LAST=(3X+7)(3X+7) 7*7=49
THAT'S WHY YOU HAVE 2 (21X) TERMS DUE TO THE OUTER & THE INNER MULTIPLICATIONS.
|
Linear_Equations_And_Systems_Word_Problems/105189: An airplane covered 24 miles of its route while decreasing its altitude by 36,000 feet. Find the slope of the airplane's line of descent. Round to the nearest hundredth. Hint: (1 mi = 5280 feet)
1 solutions
Answer 76578 by checkley75(3666) on 2007-10-19 20:54:23 (Show Source):
You can put this solution on YOUR website!USING A GRAPHING TECHNIQUE WE HAVE A STARTING POINT OF (0,0).
WE THEN HAVE ANOTHER POINT OF X=24*5,280=126,720 FEET (126,720,0)
WE ALSO HAVE A Y POINT OF -36,000 (126,720-36,000)
NOW WE CAN FIND THE SLOPE (Y2-Y1)/(X2-X1)
(-36000-0)/(126,720-0)
-36,000/126,720=-.28 IS THE VALUE OF THE SLOPE.
|
Percentage-and-ratio-word-problems/105082: Genetics : Approximately one-seventh of the people in the world are left-handed. Write down and solve an equation to estimate how many people in the US are left-handed if the population of the US is about 300 million.
1 solutions
Answer 76576 by checkley75(3666) on 2007-10-19 20:44:27 (Show Source):
|
Mixture_Word_Problems/105215: Eve was twice as old as her sister Teresa in 2006. Eve was born in 1992. How old will Teresa be in 2009.
Can you please help me, I am lost when comes to Math.
Please provide a step by step solution
Appreciate it!
Thanks
1 solutions
Answer 76568 by checkley75(3666) on 2007-10-19 20:18:39 (Show Source):
|
Rate-of-work-word-problems/105081: I have two questions
#1-After inheriting some money, a woman wants to invest enough to have an annual income of $5,000. If she can invest $20,000 at 9% annual interest, how much more will she have to invest at 7% to achieve her goal?
#2-Equal amounts are invested at 6%, 7%, and 8% annual interest, if the three investments yield total of $2,037 annual interest, find the total investment.
1 solutions
Answer 76451 by checkley75(3666) on 2007-10-18 22:18:41 (Show Source):
You can put this solution on YOUR website!.09*20,000+.07X=5,000
1,800+.07X=5,000
.07X=5,000-1,800
.07X=3,200
X=3,200/.07
X=45,714.29 IS THE AMOUNT INVESTED @ 7% TO ACHIEVE THE REQUIRED INCOME.
PROOF
.09*5,000+.07*45,714.29=5,000
1,800+3,200=5,000
5,000=5,000
--------------------------------------------------------
.06X+.07X+.08X=2,037
.21X=2,037
X=2,037/.21
X=9,700 INVESTED @ EACH RATE OF 6%, 7% & 8%.
3*9,700=29,100 IS THE TOTAL AMOUNT INVESTED.
PROOF
.06*9,700+.07*9,700+.08*9,700=2,037
582+679+776=2,037
2,037=2,037
|
Linear-equations/105078: what is the equation of the line perpendicular to -8x+2y=-2 that contains point (-5,8)
1 solutions
Answer 76449 by checkley75(3666) on 2007-10-18 22:04:33 (Show Source):
You can put this solution on YOUR website!FIRST WE NEED TO FIND THE SLOPE OF THE GIVEN LINE USING ---
Y=mX+b WHERE m=SLOPE & b= THE Y INTERCEPT.
-8X+2Y=-2
2Y=8X-2
Y=8X/2-2/2
Y=4X-1 THUS THIS EQUATION HAS A SLOPE (m)=4.
A PERPENDICULAR LINE WILL HAVE A SLOPE OF THE NEGATIVE RECIPRICAL OF THIS SLOPE:
THUS THE PERPENDICULAR LINE HAS A SLOPE=-1/4.
NOW REPLACE THE X & Y TERMS BY -5 & 8 & SOLVE FOR b.
8=-1/4*-5+b
8=5/4+b
b=8-5/4
b=(32-5)/4
b=27/4 THIS IS THE Y INTERCEPT OF THE PERPENDICULAR LINE THROUGH THE POINT
(-5,8).
Y=-X/4+27/4 IS THE DESIRED EQUATION.
|
Volume/105001: Find the volume of a right circular cone where the radius of the base is 21 in. and the height is 9 in. Give the exact value.
I think the formula is V=1/3 pie r squared h.
1 solutions
Answer 76435 by checkley75(3666) on 2007-10-18 18:00:09 (Show Source):
|
Rectangles/104997: The perimeter of a rectangle is 46 ft. The length of the rectangle is 5 ft less than 3 times the width. Find the length of the rectangle.
1 solutions
Answer 76434 by checkley75(3666) on 2007-10-18 17:55:01 (Show Source):
You can put this solution on YOUR website!L=3W-5
2L+2W=46
2(3W-5)+2W=46
6W-10+2W=46
8W=46+10
8W=56
W=56/8
W=7 ANSWER FOR THE WIDTH.
L=3*7-5
L=21-5
L=16 ANSWER FOR THE LENGTH.
PROOF
2*16+2*7=46
32+14=46
46=46
|
Triangles/104995: In a triangle, the measure of one angle is 60 degrees, the second angle is twice the measure of the third angle. Find the measures of the second and third angles.
1 solutions
Answer 76431 by checkley75(3666) on 2007-10-18 17:46:35 (Show Source):
|
Human-and-algebraic-language/104994: This question is from textbook Algebra
Suppose your sister wants to qualify for a regional gymnastics competition. At today's competition she must score at least 34.0 points. She scored 8.8 on the vault, 7.9 on the balance beam, an 8.2 on the uneven parallel bars. The event that remains is the floor exercise. a. Write and solve an inequality that models the information. b. Explain what the solution means in terms of the original situation. c. Open-Ended Write three scores your sister could make that would allow her to qualify for the regional gymnastics competition.
1 solutions
Answer 76430 by checkley75(3666) on 2007-10-18 17:43:30 (Show Source):
You can put this solution on YOUR website!7.9+8.8+8.2+X=34
24.9+X=34
X=34-24.9
X=9.1 ANSWER FOR THE SCORE NEEDED IN THE FINAL EVENT TO QUALIFY.
THE ORIGINAL SITUATION: SHE SHOULD HAVE DONE BETTER IN THE FIRST THREE EVENTS.
SHE COULD SCORE 92, 93 OR 95 IN THE FINAL EVENT & QUALIFY.
|
Trigonometry-basics/104990: Adult tickets for a play cost $15 and child tickets cost $13. If there were 26 people at a performance and the theater collected $364 from ticket sales, how many adults and how many children attended the play?
VERY bad with word problems
1 solutions
Answer 76429 by checkley75(3666) on 2007-10-18 17:36:14 (Show Source):
You can put this solution on YOUR website!15A+13C=364
A+C=26 OR A=26-C
NOW REPLACE A WITH(26-C) IN THE FIRST EQUATION.
15(26-C)+13C=364
390-15C+13C=364
-2C=364-390
-2C=-26
C=-26/-2
C=13 CHILDREN TICKETS SOLD.
26-13=13 ADULT TICKETS SOLD.
PROOF
15*13+13*13=364
195+169=364
364=364
|
Trigonometry-basics/104991: A backyard has dimensions 1 1/2 yards by 2 4/5 yards. What is the area of the back yard in square yards (yd2)?
these are whole numbers and fractions and the yd the 2 are one of those tiny numbers.
1 solutions
Answer 76428 by checkley75(3666) on 2007-10-18 17:31:45 (Show Source):
|
Travel_Word_Problems/104984: The time in seconds that it takes for an object to fall to the ground from a building that is 1400 ft high.
t=1/4 sqrt s
any help would be greatly appreciated.
1 solutions
Answer 76423 by checkley75(3666) on 2007-10-18 17:16:28 (Show Source):
|
Trigonometry-basics/104978: Determine which two equations represent parallel lines.
(a) y = 9x – 7 (b) y = –9x + 7 (c) y = 9x + 3 (d) y = -1/9x – 7
I have no idea even how to begin to figure this out. (the above is a fraction)
I put this on before but did not understand the answer. Sorry I am not so good at math.
1 solutions
Answer 76416 by checkley75(3666) on 2007-10-18 17:05:37 (Show Source):
|
Probability-and-statistics/104933: A sales representative calls on four hospitals. It is immaterial what order he calls them. how many ways can he organize his calls?
1 solutions
Answer 76378 by checkley75(3666) on 2007-10-18 10:48:53 (Show Source):
You can put this solution on YOUR website!For the first call he has 4 choices.
For the next call he has 3 choices.
For the next call he has 2 choices.
For the last call he has 1 choice.
now multiply these choices:
5*4*3*2*1=120 are the possible choices he has.
|
|
