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Fed [463]
4 years ago
8

What is the equivalent ratios for 3/7 what is the missing number 21/_

Mathematics
1 answer:
Mazyrski [523]4 years ago
7 0

Answer:49

Step-by-step explanation:

Ration is equivalent. So 21 is a multiplication of 7x3. Soto get the missing number you would also need to multiply 7x7 to keep the ratio equivalent

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A particular curve is represented parametrically by x=cost, y=−sint, t∈[0,2π]. (a) As t increases on [0,2π], in which direction
cestrela7 [59]

Answer:

a) clockwise sense

b)  x² + y² = 1

c) y ∈ [0,1]

Step-by-step explanation:

a) x = cos (t)       y = -sin (t)

for t ∈ [ 0 , 2π ]

for t = 0   point  P  is    x = cos (0)   =  1   y = -sin (0)   y = 0

The point is on the x axis

Now let´s see what happens for t = π/4  

x = cos (π/4)    x = √2/2    and   y = - sin (π/4)    y = - √2/2

Note  π/4 is 45°

The coordinates of the new point P ´(t = π/4) are in the fourth quadrant

that means the point is moving clockwise sense.

b) x = cos(t)

   y = -sin(t)

Squaring on both sides of each equation we get:

x²  = cos²t

y²  = sin²(t)

Adding side by side

x²  +  y² = cos²t  + sin²t

x²  +  y² = 1

Values for y are    y  ( 0 , 1)

8 0
3 years ago
A pendulum is raised to a certain height and released from point A, as shown in the image below. At its release, the pendulum is
sweet-ann [11.9K]

The maximum height that the pendulum can reach will be 45 meters.

<h3>How to calculate the height?</h3>

It should be noted that the total energy at A should be equal to the total energy at B.

Therefore, this will be calculated thus:

1/2(14)² + 10(35) = 1/2(0)² + mgH

98 + 350 = 10H

448 = 10H

H = 448/10

H = 44.8 meters

H = 45 meters approximately

Learn mote about height on:

brainly.com/question/983412

#SPJ1

7 0
2 years ago
Read 2 more answers
HELP ASAP!!!! ILL GIVE POINTSS!!!!​
algol [13]
The answer is b
The way I do it is the area of the front back times 2 which is 2x4x2=16
Then top and bottom times 2 which is 4x8x2=64
Then left and right which is 2x8x2=32 then you add them all together so 16+64+32=112
Hope this helped :)
8 0
4 years ago
What is your strategy for graphing a linear equation? Do you think you can use the same strategy to graph a quadratic equation?
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To graph a linear equation, you use y=mx+b. To graph a quadratic equation you use y=ax^2 + bx + c. You cannot use the same strategy to graph a quadratic equation, as in order to graph a quadratic equation, you would execute it differently. The idea is the same however, to plug numbers into the equation to find your coordinates.
3 0
4 years ago
nathan has 40 square inches of construction paper. what are all the possible rectangles with whole number side lengths that he c
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20, just cut the number in half.
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4 years ago
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