Solve the ff. problem.
1) The cost of a ballpen is 3x-2 centavos. Represent the cost in pesos of x square+2x ballpens.
2) The base of a triangle is 5x-7 cm and the altitude is 3x+2 cm. What is the area?
3) The average weight of 4x+1 boys is x+5 kg. What is their total weight?
4) A loaded truck has a weight of "2x cube-4x square+10x+7" kg. If the load alone is "x cube+3x square+5x-2" kg, what is the weight of the truck?
5) Three times a number is the same as 27 added to 6/5 of the number.
Best Luck. Thank You for answering.
2007-06-16 05:47:45 · 2 answers · asked by Alvin C. 1 in Science & Mathematics ➔ Mathematics
1 (3x-2)(x^2+2) pesos
=3x^3+6x-2x^2-4
=3x^3-2x^2+6x-4 pesos
2.[(5x-7)(3x+2)] /2
[15x^2 -21x+10x-14] /2
= 7.5x^2 -5.5x-7
3. (4x+1)(x+5)
=4x^2 +x +20x+5
=4x^2+21x+5
4.(2x^3-4x^2+10x+7)- (x^3+3x^2+5x-2)
=2x^3-4x^2+10x+7-x^3-3x^2-5x+2
=2x^3-x^3-4x^2-3x^2+10x-5x+7+2
=x^3-7x^2+5x+9 kg
5.3x=6x/5 +27
15x = 6x + 135
9x=135
x=15
2007-06-16 07:29:58 · answer #1 · answered by sweet n simple 5 · 0⤊ 0⤋
2) Area of a triangle = 1/2 base x height
= (5x - 7) (3x + 2) / 2 = (15x^2 + 10x - 21x -14) / 2 =
(15x^2 - 11x -14) / 2 sq.cm
5) 3n = 27 + 6n/5
15n = 135 + 6n
9n = 135
n = 135/9 = 15
So 15 is the number
Do the others yourself.
2007-06-16 05:55:50 · answer #2 · answered by Swamy 7 · 0⤊ 0⤋