See tutors' answers!

Algebra ->  Tutoring on algebra.com -> See tutors' answers!      Log On


   
By Tutor
 | By Problem Number | 

Tutor:
New! Get regular updates about newly solved problems via algebra.com's RSS system.

Recent problems solved by 'sofiyac'

sofiyac answered: 695 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, >>Next

Graphs/470564: Graph the function below by using its exponential form.
f(x)=log1.2^x


1 solutions
Answer 322830 by sofiyac(695) About Me  on 2011-07-15 13:06:38 (Show Source):
You can put this solution on YOUR website!
we can't graph using logs on this website

Graphs/470559: Sketch the graph of the function log2(-x+3).

1 solutions
Answer 322829 by sofiyac(695) About Me  on 2011-07-15 13:04:33 (Show Source):
You can put this solution on YOUR website!
we cant graph logs on here, use a graphing calculator

Coordinate-system/470551: (1)Sketch both lines on the same coordinate plane. State the point at which the two lines intersect: x=5,y=-2; x=-2,y=1; x=3,y=4; x=4-4,y=-1
1 solutions
Answer 322828 by sofiyac(695) About Me  on 2011-07-15 13:03:02 (Show Source):
You can put this solution on YOUR website!
The graphing calculator doesn't let us graph x=, only y=
y=-2
+graph%28+200%2C+200%2C+-5%2C+5%2C+-5%2C+5%2C+-2%29+
y=1
+graph%28+200%2C+200%2C+-5%2C+5%2C+-5%2C+5%2C+1%29+
y=4
+graph%28+200%2C+200%2C+-5%2C+5%2C+-5%2C+5%2C+4%29+
y=-1
+graph%28+200%2C+200%2C+-5%2C+5%2C+-5%2C+5%2C+-1%29+
The ones with x would look the same only they will all be VERTICAL and drawn on X axis, not Y axis

Rectangles/470611: if ABCD is the a rectangle with two sides 4 m in length and other two sides 3m in lenght, WHAT is the area of the rectangle
1 solutions
Answer 322826 by sofiyac(695) About Me  on 2011-07-15 12:59:38 (Show Source):

test/470642: Breaking the algebra down to exactly find how it became the answer step bye step I have a better understanding when its simple the much longer one are the issue really can use some help Erich
1 solutions
Answer 322825 by sofiyac(695) About Me  on 2011-07-15 12:58:07 (Show Source):
You can put this solution on YOUR website!
you didn't post a problem with this one

Exponents/470648: what is 13m+3n-3m+7n ?
1 solutions
Answer 322824 by sofiyac(695) About Me  on 2011-07-15 12:57:13 (Show Source):

Square-cubic-other-roots/470661: How do I rewrite this with rational exponents?
^5√xy^4z
1 solutions
Answer 322823 by sofiyac(695) About Me  on 2011-07-15 12:56:22 (Show Source):
You can put this solution on YOUR website!
its not copied right, make it look exactly like in the book, ie
sqrt%28x%28y%5Ez%29%29 otherwise we don't understand the problem. Thanks

Travel_Word_Problems/470664: word problem:A car traveled 126 miles in the same amount of time that a van traveled 99 miles.If the car went 15 miles per hour faster than the van, how fast did each vehicle travel?
1 solutions
Answer 322822 by sofiyac(695) About Me  on 2011-07-15 12:53:58 (Show Source):
You can put this solution on YOUR website!
van x miles per hour
car x+15 miles per hour
time=distance/rate
126%2F%28x%2B15%29=99%2Fxcross multiply
126x=99%28x%2B15%29
126x=99x%2B1485
27x=1485 divide both sides by 27
x=55 so vans speed is 55 mph
then car's speed is 55+15=70 mph

Equations/470665: how to solve this equation 1/2t+5/12=5/6?
1 solutions
Answer 322820 by sofiyac(695) About Me  on 2011-07-15 12:49:43 (Show Source):
You can put this solution on YOUR website!
is t on top or bottom? you wrote it as on the bottom

Numeric_Fractions/470650: Please help me solve -6/7 + (-9/4)
1 solutions
Answer 322819 by sofiyac(695) About Me  on 2011-07-15 12:46:32 (Show Source):

Linear-equations/470651: 6x + 4= -(x - 18)
1 solutions
Answer 322813 by sofiyac(695) About Me  on 2011-07-15 11:37:38 (Show Source):
You can put this solution on YOUR website!
6x + 4= -(x - 18)
6x + 4= -x + 18
7x = 14
x=2

Linear-systems/470644: what is 6x+4y+5z-4x+2z-7y= ?
1 solutions
Answer 322811 by sofiyac(695) About Me  on 2011-07-15 11:02:02 (Show Source):

test/470523: Essay; show all work. Consider that the age, x, of a unicorn in human equivalent years can be given by the formula f(x) = - 0.001718x4 + 0.087326x3 – 1.3367x2 + 12.46x + 3.914. When a unicorn is 2.5 years old, what is its age in human equivalent years? What about when it is 12 years old?
1 solutions
Answer 322810 by sofiyac(695) About Me  on 2011-07-15 11:01:12 (Show Source):
You can put this solution on YOUR website!
f%28x%29+=+-+0.001718x%5E4+%2B+0.087326x%5E3+%96+1.3367x%5E2+%2B+12.46x+%2B+3.914 plug in x=2.5


f%28x%29+=+-0.067109375%2B1.36446875%968.354375%2B31.15%2B3.914
f%28x%29+=+1.29735937%968.354375%2B35.06400
f%28x%29+=+1.29735937%2B26.709625
f%28x%29+=+28.0069844
Then for the next one do the same thing, but instead of 2.5 plug in 12

Number-Line/470539: x>=7 when x represent 8
1 solutions
Answer 322803 by sofiyac(695) About Me  on 2011-07-15 10:05:16 (Show Source):
You can put this solution on YOUR website!
then 8>=7 so this expression holds true

Probability-and-statistics/470561: if there is 20 apples we can distribuite these apple within 7 person and distribuite only in odd numbers
1 solutions
Answer 322802 by sofiyac(695) About Me  on 2011-07-15 09:55:57 (Show Source):
You can put this solution on YOUR website!
that's not possible

Polynomials-and-rational-expressions/470573: Essay. List the terms, coefficients, and degree of the following polynomial: 7x^4 – 3x^2 + 5x + 2/3
1 solutions
Answer 322801 by sofiyac(695) About Me  on 2011-07-15 09:51:36 (Show Source):
You can put this solution on YOUR website!
terms: 7x^4, -3x^2, 5x, 2/3
coefficients: 7, -3, 5
degree: 4

Polynomials-and-rational-expressions/470582: Write the rational expression in the simplest form, with domain restrictions.
x + 6
x2 − 3x − 54
1 solutions
Answer 322800 by sofiyac(695) About Me  on 2011-07-15 09:49:15 (Show Source):
You can put this solution on YOUR website!
you didn't copy it right, shouldn't it be a division?
%28x%2B6%29%2F%28x%5E2-3x-54%29=%28x%2B6%29%2F%28%28x-9%29%28x%2B6%29%29=1%2F%28x-9%29
restriction: x can't be equal to 9

Pythagorean-theorem/470575: please help me solve this:
The area of circle Q is 350cm^2. Find the area of square ABCD to the nearest 0.1cm^2

1 solutions
Answer 322799 by sofiyac(695) About Me  on 2011-07-15 09:46:42 (Show Source):
You can put this solution on YOUR website!
we need to see the picture since we dont know if the circle is inside square or vice versa, or half and so on

Angles/470627: what is the angle of a X when the sum is 16?
1 solutions
Answer 322798 by sofiyac(695) About Me  on 2011-07-15 09:43:41 (Show Source):
You can put this solution on YOUR website!
you need to know the measure of the other angle in order to find x

Quadratic_Equations/470590: y=-x^2+20x-4
1 solutions
Answer 322797 by sofiyac(695) About Me  on 2011-07-15 08:53:32 (Show Source):
You can put this solution on YOUR website!
a=-1
b=20
c=-4
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-20+%2B-+sqrt%28+400-16+%29%29%2F%28-2%29+
x+=+%28-20+%2B-+sqrt%28+384+%29%29%2F%28-2%29+
x+=+%28-20+%2B-+8sqrt%28+6+%29%29%2F%28-2%29+
x+=+-2%28-10+%2B-+4sqrt%28+6+%29%29%2F%28-2%29+
x+=+-10+%2B-+4sqrt%28+6+%29+

test/470601: 5x-3{x+2y-2[x+y-6(x+3)4(x-2)-1]3
1 solutions
Answer 322794 by sofiyac(695) About Me  on 2011-07-15 08:37:14 (Show Source):

Percentage-and-ratio-word-problems/470607: If an employee’s salary is multiplied
by 1.06, which corresponds to a 6% raise, the
result is $58,300. Find the employee’s current salary.

1 solutions
Answer 322791 by sofiyac(695) About Me  on 2011-07-15 08:29:49 (Show Source):

Miscellaneous_Word_Problems/470608: How Do I Solve Using Variables In Word problems?
1 solutions
Answer 322790 by sofiyac(695) About Me  on 2011-07-15 08:28:43 (Show Source):
You can put this solution on YOUR website!
you replace unknowns with letters, for example...let the unknown time be t, then t=distance/rate and so on

Length-and-distance/470618: Which speed is the fastest (use 1 mile ¡Ö 1.6 kilometers)?
1 solutions
Answer 322789 by sofiyac(695) About Me  on 2011-07-15 08:27:35 (Show Source):
You can put this solution on YOUR website!
we don't know what O with two dots is, resubmit the problem and copy it correctly

Quadratic_Equations/470621: Find the solutions to the equation below. Check all that apply.
4x^2 + 4x + 1 = 0
1 solutions
Answer 322788 by sofiyac(695) About Me  on 2011-07-15 08:27:02 (Show Source):
You can put this solution on YOUR website!
You didn't list the choices
(2x+1)(2x+1)=0
2x+1=0
2x=-1
x=-1%2F2
so there are two solutions, but they're the same

Equations/470619: -57=(X+273)/ 1.109
What is X=??
1 solutions
Answer 322785 by sofiyac(695) About Me  on 2011-07-15 08:24:44 (Show Source):
You can put this solution on YOUR website!
-57=%28X%2B273%29%2F+1.109 mulitply both sides by 1.109
-63.213=X%2B273 subtract 273 from each side
-209.787=X

Percentage-and-ratio-word-problems/470454: If there was 16 cupcakes and 20 children. What is the ratio?
1 solutions
Answer 322672 by sofiyac(695) About Me  on 2011-07-14 17:26:05 (Show Source):
You can put this solution on YOUR website!
16/20=4/5 so 4 to 5 or 4 cupcakes per 5 kids

Exponents/470425: I'm to solve for x. The equation is x^-1/7=1/4. How do I get rid of the -1/7 exponent?
1 solutions
Answer 322667 by sofiyac(695) About Me  on 2011-07-14 16:29:01 (Show Source):
You can put this solution on YOUR website!
x%5E%28-1%2F7%29=1%2F4
***************
***************
1%2F%28x%5E%281%2F7%29%29=1%2F4 move exponent to bottom, it becomes positive
***************
***************
%281%2F%28x%5E%281%2F7%29%29%29%5E7=%281%2F4%29%5E7 take each side to 7th power
***************
***************
1%2Fx=1%2F16384 cross multiply
***************
***************
x=16384

Expressions-with-variables/470423: how do you write 4x+17 in a verbal expression

1 solutions
Answer 322657 by sofiyac(695) About Me  on 2011-07-14 15:23:48 (Show Source):
You can put this solution on YOUR website!
a number times four plus seventeen.

Exponential-and-logarithmic-functions/470408: Solve the exponential equation. Use a calculator to obtain a decimal approximation, correct to two decimal places, for the solution.
3 x + 6 = 8

1 solutions
Answer 322655 by sofiyac(695) About Me  on 2011-07-14 15:23:08 (Show Source):
You can put this solution on YOUR website!

3 x + 6 = 8
3x=2
x=2/3=0.66

Exponential-and-logarithmic-functions/470413: Solve the system by the substitution method.
x + y = 11
y = x2 - 10x + 25

1 solutions
Answer 322651 by sofiyac(695) About Me  on 2011-07-14 15:12:16 (Show Source):
You can put this solution on YOUR website!
x + y = 11
y = x^2 - 10x + 25
***
y=11-x
y = x^2 - 10x + 25
11-x=x^2-10x+25
0=x^2-9x+14
0=(x-7)(x-2)
x=7 or x=2
y=11-7=4
or y=11-2=9
so (7,4) or (2,9)