Answer:
8n + n²
Step-by-step explanation:
Answer:
b) 1/5x1/5x1/5=1/125
Step-by-step explanation:
1) x = 2.5 when y = -5
2) x = 0.25 when y = - 1
<u>Solution:</u>
Given that , we have to use direction variation formula.
Now, we know that, direct variation formula is y = kx, where k is proportionality constant.
1) If y=4 when x= -2, find x when y= -5
Put y = 4 and x = -2 in y = kx
4 = k(-2)
k = - 2
Then, when y = -5
-5 = (- 2)x
x = 5/2
x = 2.5
2) If y=20 when x = -5, find x when y= -1
Put y = 20 and x = -5 in y = kx
20 = k(-5)
k = - 4
Then, when y = -1
-1 = (- 4)x
x = 1/4
x = 0.25
Hence, 1) x = 2.5 when y = -5 and 2) x = 0.25 when y = - 1
Answer:
The distance between the two boats after 2.5 hours is 57 m.
Step-by-step explanation:
The distance covered by each boat after 2.5 hours are:
speed =
distance = speed x time
For boat A, speed = 14 km/h and time = 2.5 hrs.
So that,
distance = 14 x 2.5
= 35 km
For boat B, speed = 18 km/h and time = 2.5 hrs.
So that,
distance = 18 x 2.5
= 45 km
The distance between the two boats after travelling 2.5 hours can be determined by applying the cosine rule. Let the distance be represented by x, so that:
= + - 2bc Cos A
= + - 2(45 x 35) Cos
= 2025 + 1225 - 3150 (0)
= 3250
x =
= 57.0088
x = 57.0 m
The distance between the two boats after 2.5 hours is 57 m.
Answer:
solution
x<2,2x<-4,x-2<-4 are equvalent
but x-2<4 is not