MATHEMATICS HIGH SCHOOL

A box contains 11 ​transistors, 3 of which are defective. if 3 are selected at​ random, find the probability thata. all are defective.b. none are defective.

Answers

Answer 1
Answer: To me its b. try t sure my answer on goggle

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The sum of two numbers is 92. One fifth of the first number added to one half of the second number is 34. Find the two numbers.

Answers

x + y = 92

x/5 + y/2 = 34     / both sides *10
10.x/5 + 10.y/2 = 340
2x + 5y = 340
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x + y = 92        /both sides *-2
2x + 5y = 340

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     -2x -2y = -184
+    2x +5y = 340      
           3y = 156          
             y = 32

x + y = 92
x + 32 = 92
x = 60
x+y=92\n (1)/(5)x+(1)/(2)y=34\n\n x=92-y\n 2x+5y=340\n\n 2(92-y)+5y=340\n\ 184-2y+5y=340\n 3y=156\n y=52\n\n x+52=92\n x=40

A map has a scale of 1 cm to 2.3 km. The real-life distance between two towns is 69 km. What is the distance between the two towns on the map?

Answers

Answer:

Step-by-step explanation:

Cm : km

1     :  2.3

x    :  69         Cross multily

2.3x = 69

x      =(69)/(2.3)

x      = 30cm

the distance between the two towns on the map is 30cm

Answer:

30 cm

Step-by-step explanation:

69/2.3 = 30

During the financial crisis of 2008, the price of a barrel of Brent crude oil fell a high of $140 per barrel to around $50 per barrel. What is the percent decrease in the price of oil that occurred during this period.

Answers

Answer:

  decrease of 64.3%

Step-by-step explanation:

Percentage change can be calculated from ...

  pct change = ((new value)/(original value) -1) × 100%

  = (50/140 -1) × 100%

  = (-9/14)×100% = -64 2/7% ≈ -64.3%

The price of crude fell about 64.3% in that period.

HELP PLZZZZ like asap

Answers

Answer:

The answer is B

Step-by-step explanation:

✌

Answer:

B

Step-by-step explanation:

You can substitute the variables for the values!

7x = 21

3y = -6

2x = 6

y = -2

21 - (-6)

----------

6 + (-2)

27

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4

16 PS 19E question Help
Some friends played a board game. During the game, one unlucky player had to move back 9 spaces
7 turns in a row. Find a number to represent that player's movements for those 7 turns

Answers

Answer:

-63

Step-by-step explanation:

Because -9 x 7 = -63. If the signs are different then it will be negative. -9 x 7 = -63 is the same like 9 x 7 = 63. I hope this answer your question!

A tree 7 ft tall grows an average of 6 in. each year. Which equation models the tree’s height h after x years?

Answers

Simple...

you want to find h...

it's already 7 feet tall..and grows 6 inches per year...

h=6x+7

Thus, your answer.
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