Answer:
Las dimensiones del rectángulo son:
lado corto: 5 cm
lado largo: 8 cm
Step-by-step explanation:
Consideraciones:
El perímetro de un rectángulo se calcula así:
p = 2(lado corto + lado largo)
El área de un rectángulo se calcula así:
a = lado largo * lado largo
Planteamiento:
26 = 2(a+b)
40 = a*b
a = lado largo
b = lado corto
Desarrollo:
de la primer ecuación del planteamiento:
26/2 = a+b
13 = a+b
13-a = b
sustituyendo este último valor en la segunda formula del planteamiento:
40 = a(13-a)
40 = 13*a + a*-a
40 = 13a - a²
-a² + 13a - 40 = 0
a = {-13±√((13²)-(4*-1*-40))} / (2*-1)
a = {-13±√(169-160)} / -2
a = {-13±√9} / -2
a = {-13±3} / -2
a₁ = {-13-3} / -2 = -16 / -2 = 8
a₂ = {-13+3{ / -2 = -10 / -2 = 5
If a, b, c, d is geometric sequence, then
A. 5; 15; 25; 35
B. 5; 10; 20; 40
C. 6; 12; 18; 24
D. 7; 14; 21; 28
Answer: The sequence B. 5; 10; 20; 40 is geometric.
Answer:
180 degrees
Step-by-step explanation:
ABCD is now <u>opposite </u>where it started, so it was rotated 180 degrees
I hope this helps!
(10 + 3x + 4) - (4 + 1) - (7x + 3)
(14+3x)-(5)-(7x+3)
(14+3x)-(7x)
14+ -4x
I haven’t been taking algebra 1 for that long since I’m in 8 grade And I’m just in algebra 1 as an advanced class, but I’m pretty sure this would be correct, also all the other equations above 14 + -4x are just me simplifying it. Just to make it clearer I’m pretty sure the answer is 14 + -4x
Ok we need a common coefficient of either x or y:
12x+21y=3
12x+40y=60
We can subtract one from the other to get:
19y=57
Now divide by 19 to get:
y=3
Now if we sub this back in we see that:
3x+30=15
3x=-15
x=-5