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3 years ago

Which expression is equivalent to–4–9? 4 - 9 -4+ (-9) -4 +9 4+9

Mathematics

2 answers:

attashe74 [19]3 years ago

8 0

It’s B man :))))))))))

Alborosie3 years ago

7 0

Answer:

B -4+(-9

Step-by-step explanation:

because plus a negative number is just like subtracting i belive

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A force of 8 N makes an angle of π/4 radian with the y-axis, pointing to the right. The force acts against the movement of an ob

Grace [21]

Answer:

a) F= 4 $\sqrt{2}$ i + 4 $\sqrt{2}$ j

b) Θ=11.3

c) The work done is 20 $\sqrt{2}$

Step-by-step explanation:

a) ||F||=8, α=π/4

Fx=||F||·sin(π/4)=8· $\frac{\sqrt{2}}{2}$

Fy=||F||·cos(π/4)=8· $\frac{\sqrt{2}}{2}$

F=Fx i + Fy j = 4 $\sqrt{2}$ i + 4 $\sqrt{2}$ j

b) We can find the value of Θ using the equation:

cos(Θ)= $\frac{F.D}{||F||||D||}$

where:

D= 3 i + 2 j

F=4 $\sqrt{2}$ i + 4 $\sqrt{2}$ j

The dot product is defined as the sum of the products of the components of each vector as:

F · D= $(4\sqrt{2})*3+(4\sqrt{2})*2=20\sqrt{2}$

||F||= 8

||D||= $\sqrt{3^2+2^2} =\sqrt{13}$

Hence:

Θ=arccos( $\frac{20\sqrt{2} }{8\sqrt{13} }$ )

Θ=arccos(0.981)

Θ= 11.3°

c) Work is equal to:

F · D= $(4\sqrt{2})*3+(4\sqrt{2})*2=20\sqrt{2}$ =28.3

Other way of obtainig the work is:

||F||||D||cos(Θ)

where:

||F||= 8

||D||= $\sqrt{3^2+2^2} =\sqrt{13}$

Θ=11.3°

So, ||F||||D||cos(Θ)=8× $\sqrt{13}$ ×cos(11.3°)=28.3

3 0

3 years ago

Find the twenty-fifth term of an= (-1)^n

oksano4ka [1.4K]

Answer: -1

Step-by-step explanation: plug in 25 into (-1)^n

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kirza4 [7]

Answer:

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Step-by-step explanation:

I can't help you untill you say the whole problem

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3 years ago

If ↔w||↔v, find the measurement of angle a.<br> ∠a =

hram777 [196]

Answer:

the answer is 137 degree s

Step-by-step explanation:

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6 0

3 years ago

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exis [7]

Answer: 7 5/12 + 8 1/24

Step-by-step explanation:

Hi, to answer this question we simply have to add both distances driven by Jayla:

Distance driven to the post office = 7 5/12 kilometers

Distance driven to the restaurant= 8 1/24 kilometers

Mathematically speaking:

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Feel free to ask for more if needed or if you did not understand something.

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3 years ago