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  1. R

    Substitution, algebra.

    I see now, there are no solutions, anyway you work it out. Thankyou.
  2. R

    Substitution, algebra.

    Homework Statement 5a = 5 - b 5a = 3 - b Homework Equations The Attempt at a Solution I got the solution set to be 1/2, 5/2 i used substitution for substituting a into b of the second equation, just like they were x's and y's just used a's and b's there is no difference...
  3. R

    Solving this equality. Then simple plot.

    Yes it holds. and agreed 7x/2, thanks for all the help.
  4. R

    Finding dimensions of a rectangle.

    thankyou phinds for confirming. Thanks for completing those equations Michael Redei, i seen them done that way and I didn't understand it, its much more clear now.
  5. R

    Finding slope intercept form.

    Okay, thanks for the advice, ill definitely keep that in mind. So denominators, and numerators from opposite equations can cancel early for fractions.
  6. R

    Solving this equality. Then simple plot.

    The way this equality is written is correct. So i reworked the problem, and I get this answer instead. 2* 7/2*x >= -1/4 *2 7x >= -1/2 7x/7 >= -1/2 / 7/1 x>= -1/14 which on a number plot should be about 0 to wherever (infinity)? including 0.
  7. R

    Finding slope intercept form.

    Homework Statement find the slope-intercept form for the line satisfying the following conditions x intercept 2, y intercept 2/3 Please let me know if I solved this correctly. Thankyou. Homework Equations The Attempt at a Solution 2, 0 0,2/3 (2/3 -0) / (0 - 2) 2/3 / -2/1 2/3 * -1/2...
  8. R

    Solving this equality. Then simple plot.

    Homework Statement 7/2x >= -1/4 then put it on a number plot. Homework Equations The Attempt at a Solution 7x/7 >= -2/4 = -1/2 -1/2 *7/1 = -7/2 x>= -7/2 and I'm not sure if I'm even correct for that answer, and I have to put it on a number plot.
  9. R

    Finding dimensions of a rectangle.

    Homework Statement the perimeter of a rectangle is 24 ft. the length is 4 ft longer than the width find the dimensions width x length x+4 however, I should be doing it like this: a first equation should start like: 2x+2y=? and the second should start like x=y+? so whats the...
  10. R

    Adding variables with same exponents

    Homework Statement solve. .2y^3 + .6y^3 - .5y^3 I believe the answer to be .3y^3 Homework Equations The Attempt at a Solution i got the answer to be .8y^3 - .5y^3 = .3y^3 I think this is correct, I'm not sure, please let me know if I finished this correctly.
  11. R

    Area of this triangle

    Yeah, I just want to make sure I was solving these problems correctly, and I had to have a confirm :) ,thankyou!
  12. R

    Find slope of line, two points on the line are included

    thankyou upon checking my work, i got the m = 6 and the b = 95 and I also used the new point slope formula, thanks.
  13. R

    Area of this triangle

    Homework Statement area of triangle with a base of: 2 & 3/4 and a height of 4/9 Homework Equations 1/2 * (b*h) The Attempt at a Solution i used: 1/2*(11/4 * 4/9) = 44/72 = 22/36 = 11/18
  14. R

    Using symbols to rewrite the problem and then solve it.

    Homework Statement use symbols to write and evaluate this problem four squared divided by two to the fourth power Homework Equations The Attempt at a Solution 4^2 / 2^4 the answer I get is 1
  15. R

    Find slope of line, two points on the line are included

    Homework Statement find the slope of this line it contains these points: (-16, -1) , (-17, -7) Homework Equations y = mx + b The Attempt at a Solution i got y = 3/8x - .625 is that correct? my work i use -7 +1 / -17 + 1 ==-6/16 ==6/16 = 3/8 then i used -7 =...
  16. R

    Image created by concave mirror, sight from a distance.

    Hmm, so your asking if perhaps I could see my image? Then the light would be going towards me, at me, but that is not happening?
  17. R

    Image created by concave mirror, sight from a distance.

    Okay, so a counter question is this, why can't I turn around and see my image? You're definitely free to turn around, but why won't that help you see your image? another tutor asked me this. I was dumbfounded because I thought I was facing the mirror to begin with. So, help please.
  18. R

    Electron moving from point A to B. electron potential higher?

    The textbook explanation is simply that electric potential is equal to electric potential energy per unit charge.
  19. R

    Using Kirchoff's junction rule for current from a battery.

    Okay, so using series formula, 27V/(2ohms+5ohms) = 3.8V?
  20. R

    Electric field at origin, zero or nonzero?

    Homework Statement Point charges +q and -q are placed at +50 cm and -50 cm on the x-axis, respectively. Is the electric field at the origin (halfway between the charges) zero or nonzero? If nonzero, which direction does it point? Homework Equations The Attempt at a Solution If...
  21. R

    Using Kirchoff's junction rule for current from a battery.

    Homework Statement Use Kirchhoff's junction rule to calculate the current supplied by the battery. Homework Equations attached a pic. The Attempt at a Solution Where do we start?
  22. R

    Electron moving from point A to B. electron potential higher?

    the electron charge is negative. Electric potential: measure of work required by an electric field to move a charge. (Voltage)
  23. R

    Electron moving from point A to B. electron potential higher?

    Okay, I realized that I missed something in the question where it said it was gaining speed. So, as the electron is approaching B, its potential is rising, as the potential is rising so is the Electric potential energy, it is also rising. The electric Potential is higher at B, how can I prove...
  24. R

    Current through resistor, with heat. What happens to the current?

    Okay, so as the wire heats up the resistance of the wire increases, this causes the current to decrease. Is that correct?
  25. R

    Current through resistor, with heat. What happens to the current?

    Homework Statement Suppose a current of 1 A is flowing through a resistor. If this makes the resistor heat up, will the current through the resistor increase, decrease, or remain constant? Assume the voltage applied to the resistor is constant. Homework Equations The Attempt at a...
  26. R

    Electron moving from point A to B. electron potential higher?

    Homework Statement An electron , influenced only by electric fields and forces, moves from A to B. When it reaches B, its speed is higher than it was at A. Is the electric potential higher at A or at B? Homework Equations The Attempt at a Solution So as the electron gets closer...
  27. R

    Point charges, midpoint zero or non zero?

    Homework Statement Point charges +q and -q are placed at +50 cm and -50 cm on the x-axis, respectively. Is the electric field at the origin (halfway between the charges) zero or nonzero? If nonzero, which direction does it point? Homework Equations The Attempt at a Solution Well...
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