Carry The Two

Positive + Positive = Positive Negative + Negative = Negative Subtracting a Negative is the same as adding: 8 - (-3) = 8 + 3 = 11 The sum of a negative and a positive: Use the sign of the large number and then subtract: Example 1 8 + (-12) = -4 Example 2 (-7) + 17 = 10 Example 3 7 + (-3) = 4 Example 4 18 + (-20) = -2 Positive x Positive = Positive Negative x Negative = Negative Positive x Negative = Negative Negative x Positive = Negative Positive  ÷ Positive = Positive Negative  ÷ Negative = Positive Negative  ÷ Positive = Negative Positive  ÷ Negative = Positive

Definition The percent error expresses the difference between an approximate or measured value and the exact value.  To find the percent error you must first find the greatest possible error. Approximate Error v. Exact Error Exact error is found by subtracting the approximate value from the exact value.  Negative signs should be ignored.  If I made an approximation of $350 and the actually value is $400: 350 - 400 = -50 We would ignore the negative sign therefore the exact error is 50. Percentage Error The percentage error allows you to see the error as a percent of the exact value.  To find the percentage error, we divide the exact error by the exact value: 50/400 = .125 or 12.5%

ONE Use your notes and homework.  Rework the problems.  Many teachers recycle questions.  Treat your homework and classwork questions like a warm-up for the actual exam.  Do not skip problems. TWO Use your resources! You Youtube and Google everything else, why wouldn't you do the same for an Algebra concept that you do not understand? THREE Practice makes perfect.  When you think you got it, the studying has just began.  Set aside more time in order to master the material. FOUR Do not cram.  You have to plan strategically if you want the grade that you desire.  Do not wait until the last minute! FIVE Use flash cards to memorize formulas and rules.  This does not mean make them and set them aside.  Use them!

The midpoint is the point on a line segment that divides it into two equal parts. The midpoint formula is as follows: Example The endpoints of a line are (4, 8) and (4, 0).  Find the coordinates of the midpoint. Plug the points into the midpoint formula: x: ((4 + 4) / (2)) = 4 y: ((8+0) / (2)) = 4 Therefore the midpoint is (4, 4)