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Crazy boy [7]
3 years ago
6

The current I in a device is related to time t by the equation I=10t-5t^2+2.Calculate the maximum current and time taken to reac

h maximum current.
Mathematics
2 answers:
zavuch27 [327]3 years ago
8 0

Answer:

Step-by-step explanation:

The current I in a device is related to time t by the equation

I = 10t - 5t² + 2

The equation is a quadratic equation. The plot of this equation on a graph would give a parabola whose vertex would be equal to the maximum current in the device

The vertex of the parabola is calculated as follows,

Vertex = -b/2a

From the equation,

a = - 5

b = 10

Vertex = - 10/2 × - 5 = - 10/ - 10 = 1

Therefore, the time taken to reach maximum current is 1

The maximum current would be

I = (10 × 1)- (5 × 1²) + 2

I = 10- 5 + 2 = 7

taurus [48]3 years ago
7 0

Answer:

  • maximum current: 7
  • time to reach maximum: 1

Step-by-step explanation:

The equation can be rewritten to vertex form to find the maximum value:

  I = -5(t^2 -2t) +2 . . . . . . factor leading coefficient from variable terms

  I = -5(t^2 -2t +1) +2 -(-5(1)) . . . . . add and subtract the square of half the t coefficient

  I = -5(t -1)^2 +7 . . . . . . write in vertex form

The vertex of the graph is at (t, I) = (1, 7).

The maximum current of 7 is reached at t=1.

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In ΔDEF, EF = 15, FD = 13, and DE = 4. Which list has the angles of ΔDEF in order from smallest to largest?
Rudik [331]

Answer:

< F , < E, < D

Step-by-step explanation:

ΔDEF

Arrange the sides from smallest to largest

DE = 4, FD = 13, and EF = 15.

Largest side opposes the largest angle, medium side opposes the medium angle, smallest side opposes  the smallest angle.

the angles of ΔDEF in order from smallest to largest

< F , < E, < D

7 0
3 years ago
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garik1379 [7]

(15a^4 - 30a^5 )/5a^2

= 5a^2(3a^2 - 6a^3) / 5a^2

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or

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4 0
3 years ago
Define Following:consistent equations
mario62 [17]

Answer:

1. Consistent equations

x + y = 3

x + 2·y = 5

2. Dependent equations

3·x + 2·y = 6

6·x + 4·y = 12

3. Equivalent equations

9·x - 12·y = 6

3·x - 4·y = 2

4. Inconsistent equations

x + 2 = 4 and x + 2 = 6

5. Independent equations

y = -8·x + 4

8·x + 4·y = 0

6. No solution

4 = 2

7. One solution

3·x + 5 = 11

x = 2

Step-by-step explanation:

1. Consistent equations

A consistent equation is one that has a solution, that is there exist a complete set of solution of the unknown values that resolves all the equations in the system.

x + y = 3

x + 2·y = 5

2. Dependent equations

A dependent system of equations consist of the equation of a line presented in two alternate forms, leading to the existence of an infinite number of solutions.

3·x + 2·y = 6

6·x + 4·y = 12

3. Equivalent equations

These are equations with the same roots or solution

e.g. 9·x - 12·y = 6

3·x - 4·y = 2

4. Inconsistent equations

Inconsistent equations are equations that are not solvable based on the provided set of values in the equations

e.g. x + 2 = 4 and x + 2 = 6

5. Independent equations

An independent equation is an equation within a system of equation, that is not derivable based on the other equations

y = -8·x + 4

8·x + 4·y = 0

6. No solution

No solution indicates that the solution is not in existence

Example,  4 = 2

7. One solution

This is an equation that has exactly one solution

Example 3·x + 5 = 11

x = 2

3 0
4 years ago
What is x and y of 5x+4y=8
juin [17]

Answer:

y=2-5x/4     x=8/5-4y/5

Step-by-step explanation:

8 0
3 years ago
The advertised size of a computer or television screen is actually the length of the diagonal of
andreyandreev [35.5K]

Answer:

37.5 cm

Step-by-step explanation:

See attached for reference.

let the diagonal be x,

By Pythagorean formula:

x² = (22.5)² + (30)²

x = √[(22.5)² + (30)²]

x = 37.5 cm

4 0
3 years ago
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