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2 years ago

Which expression calculates the speed in meters per second of an object that travels a distance of 40 m every 10 s?

Mathematics

2 answers:

maria [59]2 years ago

6 0

Answer:

40/10 [4 meters/sec]

Step-by-step explanation:

Watch for what the units are telling us. The number that is being requested

is speed in units of meters/sec. We are given 40 meters and 10 seconds. If we divide 40 meters by 10 seconds (10 meters/10 seconds), we get 4 meters/sec, the correct dimension.

kipiarov [429]2 years ago

5 0

40x10 is the correct one

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The sum of a number and its reciprocal is 41/20. Find the number. smaller value larger value

Natali [406]

Step-by-step explanation:

Let the number is x. Its reciprocal will be 1/x. According to given condition, we get :

$x+\dfrac{1}{x}=\dfrac{41}{20}\\\\\dfrac{x^2+1}{x}=\dfrac{41}{20}\\\\20x^2+20=41x\\\\20x^2-41x+20=0$

It is a quadratic equation. The values of x are :

$20x^2-25x - 16x+ 20 =0\\\\5x(4x - 5) -4( 4x - 5) = 0\\\\(5x-4)(4x-5)=0\\\\5x-4=0\ \text{and}\ (4x-5)=0\\\\x=\dfrac{4}{5}\ \text{and}\ x=\dfrac{5}{4}$

The smaller number is 4/5 and the larger number is 5/4.

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2 years ago

15 points please help

Molodets [167]

The answer is x= -21

3x-3=6(x-10)

7 0

2 years ago

How do you find a vector of length 10 in the direction of vequals=left angle 3 comma negative 2 right angle3,−2?

Kazeer [188]

First we look for the angle of the vector, which will be given by:
tan (x) = (- 2/3)
Clearing x we have:
x = ATAN (-2/3) = - 33.69 degrees.
Which means that the angle is 33.69 degrees measured clockwise from the x axis.
Equivalently the angle is
360-33.69 = 326.31 degrees
326.31 degrees measured counterclockwise from the x axis.
The vector is then:
v = 10 (cos (326.31) i + sin (326.31) j)
answer
v = 10 (cos (326.31) i + sin (326.31) j)

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Could anyone help me with this question? And could you also provide a explanation? I would be so grateful for any help.

Art [367]

Answer:

Step-by-step explanation:

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myrzilka [38]

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