28.-
Decreciente : (2,3) (3,5) (7,8)
Creciente : (5,7)
Continuo : (1,2)
Minimo : (5,23)
Maximo : (7,27)
Punto de corte (x) : -
Punto de corte (y) : -
29.-
Students I Days enough food
15 --- 8
20 --- x
15.8 = 20x
120 = 2ox
120/20 = x ; x =6
(*) Inverse,because with more students, it isnt gonna be enough food for everyone less days.
31.-
Number 2 3 4 5 6 7 9 10 11
630 Yes Yes No Yes Yes Yes Yes Yes No
308 Yes No Yes No No Yes No No Yes
440 Yes No Yes Yes No No No Yes Yes
13860 Yes Yes Yes Yes Yes Yes Yes Yes Yes
32.-
h^2 = c^2 + c^2
h^2 = 7^2 + 24^2
h^2 = 49 + 576
h^2 = 625 ; raiz cuadrada de 625 = 25
Perimeter - 56 mm
33.-
The number 103 is a prime number,because it can't be divided for any number except for himself an the number 1. The number 161 inst a prime number,because it can be divided for 7.
34.-
a) (2 x^3 - 4x^2 + 5-x) + (4x^2-6x+3)-(5x^3+8x^2+x-4) = -3x^3+8x^2-5x+12
b) (3x+2)(3x-2)-8x+9 = 9x^2-6x+6x-4-8x+9 = 9x^2 - 8x+ 5
c) (8x^2-3x+1)(-x^2+2x-5) = -8x^4+16x^3-40x^2+3x^3-6x^2+15x-x^2+2x-5 = 8x^4+19x^3-47x^2 17x-5.
35.-
20g 32' 20'' + 30g 40' 45'' = 51g 13' 05''
A+B = 51 g 13' 05"
36.-
a)
Cakes D Money
1 ---------- 0,5
x ----------- 30
b) y = 0,5 . 1
y = 0,5 . 2
y = 0,5 . 3
c) 50.0,5 = 25 if they sell 50 cakes
d) 54 : 0,5 = 108 cakes they sold if they can 54 euros
37.-
Isoscels Trapezoid
First triangle b.a/2 = 1.2/2 = 1cm^2
Square b.a = 3.2 = 6 cm^2
1+1+6=8 cm^2
h^2 = c^2 + c^2
h^2 = 1^2 +n2^2
h^2 = 1 + H = 5 = 2,23 cm
Perimeter = 5+3+2,23.2 = 12,44 cm
38.-
a) 42= 2.3.7
100= 2^2.5^2
MCM = 2^2.3.7.5^2 = 2100
MCD = 2
b) 550= 2.5^2.11
441= 3^2.7^2
MCM= 2.5^2.3^3.7^2.11= 242550
MCD= 1
c)200= 2^3.5^2
180= 2^2.3^2.5^
780= 2
MCM= 2^3.3^2.5^2
MCD= 2^2.5 = 20
39.-
5/3,1/4,5/10
12/20,5/20,10/20
5/20<10/20<12/20
40.- 24.50/100 = 12 of discount 50-12=38 euros is the price now.
No comments:
Post a Comment