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4 years ago

What is the answer to 8×{[(7+4)×2]-[(11-7)×4]}

Mathematics

1 answer:

Ymorist [56]4 years ago

3 0

Answer:

I believe that it is 48.

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If sinA = cosB, what is the relationship between A and B if A and B are both acute angled ?

Bess [88]

Answer:

We know sinA=cos(90−A)

Given, sinA=cosB

cosB=cos(90−A)

⇒B=90−A

⇒A+B=90

Hence, A+B=90

8 0

3 years ago

Two particles move in the xy-plane. At time t, the position of particle A is given by x(t)=5t−5 and y(t)=2t−k, and the position

Ipatiy [6.2K]

Answer:

Part A) Not collide

Part B) k = 4

Part C) Particle B is moving fast.

Step-by-step explanation:

Two particles move in the xy-plane. At time, t

Position of particle A:-

$x(t)=5t-5$

$y(t)=2t-k$

Position of particles B:-

$x(t)=4t$

$y(t)=t^2-2t+1$

Part A) For k = -6

Position particle A, (5t-5,2t+6)

Position of particle B, $(4t,t^2-2t-1)$

If both collides then x and y coordinate must be same

Therefore,

For x-coordinate:

5t - 5 = 4t

t = 5

For y-coordinate:

$2t+6=t^2-2t-1$

$t^2-4t-7=0$

$t=-1.3,5.3$

The value of t is not same. So, k = -6 A and B will not collide.

Part B) If both collides then x and y coordinate must be same

For x-coordinate:

5t - 5 = 4t

t = 5

For y-coordinate:

$2t-k=t^2-2t-1$

Put t = 5

$10-k=25-10-1$

$k=4$

Hence, if k = 4 then A and B collide.

Part C)

Speed of particle A, $\dfrac{dA}{dt}$

$\dfrac{dA}{dt}=\dfrac{dy}{dt}\cdot \dfrac{dt}{dx}$

$\dfrac{dA}{dt}=2\cdot \dfrac{1}{5}\approx 0.4$

Speed of particle B, $\dfrac{dB}{dt}$

$\dfrac{dB}{dt}=\dfrac{dy}{dt}\cdot \dfrac{dt}{dx}$

$\dfrac{dB}{dt}=2t-2\cdot \dfrac{1}{4}$

At t = 5

$\dfrac{dB}{dt}=10-2\cdot \dfrac{1}{4}=2$

Hence, Particle B moves faster than particle A

8 0

4 years ago

1. What is the value of x? 2. What is the value of x?

Ann [662]

1. x = (11y+8)/7

2. x = 12

8 0

3 years ago

Read 2 more answers

If f(x) = 5x2 + 3, find f(-2) =

Brut [27]

Answer:To find this, all you have to do is plug in 3 where x is in the equation, which gives you this:

(

)

(

)

−

. From there, just find the value:

(

)

−

Step-by-step explanation: 13 is the answers sorry i looks like that

8 0

3 years ago

The first day of shooting a movie, a director uses 30% of a film reel. The strip of

wel

Answer:

Step-by-step explanation:

30% of 90 can be written as 30% × 90

= 30/100 × 90

= 27

4 0

2 years ago