Let x - hours Carlos drove ; Let y - hours Maria drove
Equation 1: x + y = 4.4
x = 4.4 - y
Equation 2: 55x + 50y = 233
55(4.4 - y) + 50y = 233
242 - 55y + 50y = 233
-5y = 233-242
-5y = -9
y=9/5 or 1.8 hours Maria drove
To find time Carlos drove:
x=4.4 - 1.8
x = 2.6 hours
Answer:
The intial value is 1.25
Step-by-step explanation:
Answer:
13, 16, 18
Step-by-step explanation:
Sabemos que podemos calcular el total de plumas amarillos, por medio de la media.
16 = (12 + 14 + 15 + 24 + x + y + z) / 7
16 * 7 = 12 + 14 + 15 + 24 + x + y + z
112 = 65 + x + y + z
x + y + z = 112-65
x + y + z = 47
sabemos que la mediana es el valor medio, y que ese 46 debe dividirse entre 3 valores porque son 3 cajas, entonces debemos buscar los números adecuados para el valor 15 esté en la mitad, es decir de cuarto.
Sin meter los valores nuevos, el ranking sería así:
12
14
15
24
el 15 esta de tercero, para que quede de cuarto, debe tener dos valores por debajo y un por arriba, así:
X
12
14
15
y
z
24
Por lo tanto, valores mayores a 15 serían por ejemplo y = 16 y z = 18:
16 + 18 = 34
x = 47-34 = 13
quedaría:
12
13
14
15
dieciséis
18 años
24
Si recalculamos la media:
m = (12 + 14 + 15 + 24 + 13 + 16 + 18) / 7 = 16
Answer: the length of the walkway is 30.64ft
The width of the walkway is 8.16ft
Step-by-step explanation:
Since the walkway has length and width, it is rectangular in shape. For a rectangle, the two lengths and two widths are equal. The area is expressed as length, L × Width,W.
The front walkway from the street to Pam's house has an area of 250ft^2. It means that
LW = 250
Its length is two less than four times its width. It means
L = 4W - 2
Substituting L = 4W - 2 into LW = 250, it becomes
W(4W - 2) = 250
4W^2 - 2W- 250 = 0
Using the general formula for quadratic equations,
W = [- b ± √b^2 - 4ac]/2a
a = 4
b = -2
c = - 250
W= [- - 2 ±√-2^2 -4(4 × -250)]/2×4
= (2 ± √4 + 4000)/8
= (2 ±63.277)/8
W= (2 + 63.277)/8 or W = (2 - 63.277)/8
W = 8.16 or W = - 7.91
Since the width cannot be negative, width = 8.16 ft
LW = 250
8.16L = 250
L = 250/8.16 = 30.64 ft
Answer:
d. y = -2×
Step-by-step explanation:
First to solve find the slope using the formula, 
. The slope equals 20/-10 or -2. Then plug the slope and point, (-5,10), into slope-point form. y-10=-2(x+5), then solve for y. This gives you y=-2x+0 or y=-2x.
