Operations on Algebraic Expressions A. Tick (M) the correct answer :
1. The sum of - 3x² - 4x?y² + 3y4 and 5x² + 4x?y? - yA :
(i) 2x2 – 2y2
(ii) 2x2 + 2y4
(iii) 2x2 - 8x?y2 + 2y4 (iv) 2x? +8x?y2 + 2y
The sum of - 5ab,- 2ab and 16ab is :
(i) 9a²b2
oli
(iii) 7ab
(iv) 13ab
(ii) Sab
3. – 2x²y3 – 2x²y3 + 8x?y is equivalent to :
(i) 4x?y?
(ii) 8x²y3
(iii) 4x²y3
(iv) 8x?y?
4. The product of (3x - 4) and (4x + 5) is :
(i) 12x2 - X
(ii) 12x2 - X-20
(iii) 14x-X
(iv) 12x - x2
5. On subtracting x4 - 4x²y2 + y4 from x4 + 8x?y2 + y^, we get :
(i) – 12x²y?
(ii) - 12xy
-
(iv) 12xy
(iii) 12xy
B. Subtract:
2. 3a from 7a
1. 8p from 12p

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

Find the solution of this system of equation -7x+y=-20 9x-3y=36

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.