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galina1969 [7]
3 years ago
5

A box contains 30 radio chips of which 10 are defective. If 7 chips are picked at random out of the box randomly, what is the pr

obability that at least 8 are defective?
Needs to show all work.
Mathematics
2 answers:
babunello [35]3 years ago
8 0

Answer the chace is 50%

Step-by-step explanation:

because if you  defined it then simplify it u get 50

Tanzania [10]3 years ago
6 0

Answer my question first

if one ratio is given find all other find sin30+cos30?

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In his boat, Sheldon can travel 45 mi downstream in the same time that it takes to travel 9 mi upstream. If the rate of the curr
Nataliya [291]

Answer:

9 mph

Step-by-step explanation:

-let x be the speed of current and t be time. The speed equation for both directions can then be represented as:

Speed=\frac{Distance}{Time}\\\\\#Upstream\\(u-6)t=9\\\\\#Donwstream\\\\(u+6)t=45

#Since t is equal in both, we can do away with t.

#We the divide the downstream equation by the upstream equation as:

\frac{u+6}{u-6}=\frac{45}{9}\\\\(u+6)=5(u-6)\\\\u+6=5u-30\\\\4u=36\\\\u=9

Hence, the boat's speed in still water is  9 mph

7 0
3 years ago
Solve P=Kt/v for k
yan [13]
Multiple both sides of the equation by V, and divide both sides by T.. You'll get PV/T=KT/V*(V/T)=K.
8 0
3 years ago
Can someone help me with this. Will Mark brainliest.
Anon25 [30]

Answer:

the distance between the two points is √130.

Step-by-step explanation:

a^2 + b^2 = c^2

a^2 = 9^2 = 81

b^2 = 7^2 = 49

c^2 = 81 + 49 = 130

c = √130

4 0
3 years ago
Josie has $47 left on her checking account. If she writes a check for $55,
kozerog [31]

Answer:

-8

Step-by-step explanation:

47-55=-8

3 0
2 years ago
Read 2 more answers
Solve for x. Round answer to the nearest tenth (0.1).
ICE Princess25 [194]

Answer:

x = 9.9

Step-by-step explanation:

This is a isosceles triangle, with sides measurements (1 , 1 , √2), and the angles being (45° - 45° - 90°). Note that the side measurements of 1 is opposite of that of a 45°, while the measurement of √2 is opposite of that of 90°.

In this case, multiply. The side measurement of 1 has 7.

1 x 7 = 7

In the same, you must multiply 7 with √2

x = 7 * √2 = 7√2.

√2 = ~1.414

7 x 1.414 = 9.898

Round to the nearest tenth:

9.898 rounded to the nearest tenth = 9.9

x = 9.9

~

3 0
3 years ago
Read 2 more answers
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