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Sergeeva-Olga [200]
3 years ago
12

PLEASE HELP!!!!!!

Mathematics
2 answers:
aksik [14]3 years ago
6 0

Answer: the answers are 1.8 and 3.2 seconds. So both B and C.

Step-by-step explanation:

Bad White [126]3 years ago
5 0

Answer:

Option 1 and 3 - 1.3 seconds and 3.2 seconds

Step-by-step explanation:

Given : The equation that models the height above or below equilibrium in inches, h, of a spring over time in seconds, t, is h=-30\cos(\frac{2\pi}{5} t).

To find : At which times will the spring be at a height of 20 in. above equilibrium?        

Solution :

We have given,              

The equation that models the height above or below equilibrium in inches      

h=-30\cos(\frac{2\pi}{5} t)

We have to find at h=20 inches the time of spring.

We show it graphically,

Plot the graph of the model  h=-30\cos(\frac{2\pi}{5} t)

Then, Substitute h=20

The points of their intersections are the solution of the model.

The intersection points are (1.831,20), (3.169,20) and many more.

From the given options,

The time are 1.3 seconds and 3.2 seconds.

Therefore, Option 1 and 3 are correct.    

Refer the attached figure below.  

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Find all the square roots of x2 ≡ 53 (mod 77)
Nikolay [14]

Answer:

x=\pm\sqrt{77n+53}

Step-by-step explanation:

We have been given an equivalence equation x^2\equiv 53\text{ (mod } 77). We are asked to find all the square root of the given equivalence equation.

Upon converting our given equivalence equation into an equation, we will get:

x^2-53=77n

Add 53 on both sides:

x^2-53+53=77n+53

x^2=77n+53

Take square root of both sides:

x=\pm\sqrt{77n+53}

Therefore, the square root for our given equation would be x=\pm\sqrt{77n+53}.

3 0
3 years ago
Lin has a drawing with an area of 18 square inches. If she increases all the sides by a scale factor of 3, what will the new are
Amiraneli [1.4K]

Answer:

2/3

Step-by-step explanation:

the slope of a line is equal to the rise/run. in this case the line rises 2 units for every +3 units it moves

sry if wrong but i hope it helps

3 0
2 years ago
The mean for a set of 5 numbers is 24. Four of the numbers 18,30,24, and 27. What is the fifth number?
ioda

Answer:

21 it is the fifth number

5 0
2 years ago
If a jug is 1/5 full and weighs 250g and 4/5 full and weighs 550g how much does the jug weigh empty
Alika [10]
1/5 full =250g
4/5 full =550g
550g-250g=300g=3/5 without jug
1/5 without jug=300g/3=100g
250g-100g=150g

<u>The jug weighs 150g empty</u>

6 0
3 years ago
Read 2 more answers
Hii can someone pls help, I’m not sure what the answer is
konstantin123 [22]

Answer:

i think its quadratic

Step-by-step explanation:

4 0
3 years ago
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