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4 years ago

15

Find the product: -1(-28)=

1 answer:

musickatia [10]4 years ago

4 0

Answer:

the answer is 28

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An electrician charges $40 for each hour he works plus a $125 service charge. The total charge for a recent job was $1,205. Whic

maks197457 [2]

Answer:

Answer is D.

Step-by-step explanation:

40h is what you start out with since it costs 40 ever hour. then you add the service charge which makes it 40h + 125, and then since the total charge is 1205, that would complete the equation.

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3 years ago

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Find the velocity and position vectors of a particle that has the given acceleration and the given initial velocity and position

stira [4]

Answer:

$v(t) = (2t+1) \mathbb{i} +3t^2 \mathbb{j} +4t^3 \mathbb{k}$

$r(t) = (t^2+t) \mathbb{i} +(t^3+2) \mathbb{j} +(t^4 - 3) \mathbb{k}$

Step-by-step explanation:

The velocity vector is the integral of the acceleration vector i.e.

$v(t) = \int a(t) dt$

$v(t) = \int (2 \mathbb{i}+6t \mathbb{j} 12t^2 \mathbb{k}) dt$

$v(t) = 2t \mathbb{i}+3t^2 \mathbb{j} 4t^3 \mathbb{k} + C_1$

When $t=0$ , $v(0) = \mathbb{i}$ . Inserting these values in $v(t)$ ,

$C_1= \mathbb{i}$

$v(t) = 2t \mathbb{i}+3t^2 \mathbb{j} 4t^3 \mathbb{k} + \mathbb{i}$

$v(t) = (2t+1) \mathbb{i}+3t^2 \mathbb{j} 4t^3 \mathbb{k}$

The position vector is the integral of the velocity vector i.e.

$r(t) = \int v(t) dt$

$r(t) = \int ((2t+1) \mathbb{i}+3t^2 \mathbb{j} 4t^3 \mathbb{k}) dt$

$r(t) = (t^2+t) \mathbb{i}+t^3 \mathbb{j} t^4 \mathbb{k} + C_2$

When $t=0$ , $r(t) =2\mathbb{j}-3\mathbb{k}$ . Inserting these values in $r(t)$ ,

$C_2=2\mathbb{j}-3\mathbb{k}$

$r(t)= (t^2+t) \mathbb{i}+t^3 \mathbb{j}+ t^4 \mathbb{k} + 2\mathbb{j}-3\mathbb{k}$

$r(t) = (t^2+t) \mathbb{i}+(t^3+2) \mathbb{j}+ (t^4-3) \mathbb{k}$

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4 years ago

A sampling of 20 inpatients in Hospital X's intensive Care Unit revealed an average lenght of stay of 3.5 days with a standard d

solmaris [256]

Answer:

cghgvjbhkjknlm:L<";jhku.gyj,tfhdmrgeszfhxv bjnkmlk;l<"l/mkjhgjfhtdgrxcvh bjhkml;,';./

Step-by-step explanation:

ahxchigfxjfhjjm jk kj ub'u 'kj ibl

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4 years ago

10 points for two questions please don’t write anything just to take my points

Westkost [7]

Answer:

5) J:(-1,1) A:(-1,-3) I:(3,-2)

6) J:(0,0) M:(3,1) E:(0,-1) X:(5,0)

Step-by-step explanation:

5) x + 4, y - 4

6) x + 2, y + 3

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3 years ago

A plane is traveling due north. The wind is blowing 30° east of north at 60 miles/hour. At what speed must the plane fly to trav

Sunny_sXe [5.5K]

If there is an answer between 40 and 43 choose that answer. You would need to slow speed to allow more tragectory of the planes directions

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3 years ago

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