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IRISSAK [1]
3 years ago
8

A box contains 10 ​transistors, 3 of which are defective. If 3 are selected at​ random, find the probability that a. All are def

ective. b. None are defective.
Mathematics
2 answers:
bixtya [17]3 years ago
6 0
3/10(2/9)(1/8)

3/10(3/9)(3/8)
kherson [118]3 years ago
5 0
A) 3/10 x 2/9 x 1/8= 1/120

b) 1-1/120=119/120
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A bicycle store costs ​$3300 per month to operate. The store pays an average of ​$75 per bike. The average selling price of each
Klio2033 [76]
S=Selling price 135
V=Variable cost 75
F=Fixed cost 3300
Let quantity be Q
The formula to break even is
135Q-75Q-3300=0
Solve for Q
60Q-3300=0
60Q=3300
Q=3300/60
Q=50
So the store must sell 50 bicycles to break even

Hope it helps!

6 0
3 years ago
Read 2 more answers
Could someone help me rnnn?
GuDViN [60]

Answer:

vertex = (0, -4)

equation of the parabola:  y=3x^2-4

Step-by-step explanation:

Given:

  • y-intercept of parabola: -4
  • parabola passes through points: (-2, 8) and (1, -1)

Vertex form of a parabola:  y=a(x-h)^2+k

(where (h, k) is the vertex and a is some constant)

Substitute point (0, -4) into the equation:

\begin{aligned}\textsf{At}\:(0,-4) \implies a(0-h)^2+k &=-4\\ah^2+k &=-4\end{aligned}

Substitute point (-2, 8) and ah^2+k=-4 into the equation:

\begin{aligned}\textsf{At}\:(-2,8) \implies a(-2-h)^2+k &=8\\a(4+4h+h^2)+k &=8\\4a+4ah+ah^2+k &=8\\\implies 4a+4ah-4&=8\\4a(1+h)&=12\\a(1+h)&=3\end{aligned}

Substitute point (1, -1) and ah^2+k=-4 into the equation:

\begin{aligned}\textsf{At}\:(1.-1) \implies a(1-h)^2+k &=-1\\a(1-2h+h^2)+k &=-1\\a-2ah+ah^2+k &=-1\\\implies a-2ah-4&=-1\\a(1-2h)&=3\end{aligned}

Equate to find h:

\begin{aligned}\implies a(1+h) &=a(1-2h)\\1+h &=1-2h\\3h &=0\\h &=0\end{aligned}

Substitute found value of h into one of the equations to find a:

\begin{aligned}\implies a(1+0) &=3\\a &=3\end{aligned}

Substitute found values of h and a to find k:

\begin{aligned}\implies ah^2+k&=-4\\(3)(0)^2+k &=-4\\k &=-4\end{aligned}

Therefore, the equation of the parabola in vertex form is:

\implies y=3(x-0)^2-4=3x^2-4

So the vertex of the parabola is (0, -4)

5 0
2 years ago
Read 2 more answers
Help me please omg help me
3241004551 [841]

Answer:

I think its Quadratic term

Step-by-step explanation: Correct me if I'm wrong :D

4 0
2 years ago
When 15 times a number is.
lubasha [3.4K]

Answer:

2

Step-by-step explanation:

15x + 16 = 48 - x

16x = 32

x = 2

Plug two in and it fits right in :)

8 0
3 years ago
65 POINTS!!! ANSWER ASAP PLEASE!
Mice21 [21]

Answer:

abt 75%

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
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