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noname [10]
3 years ago
10

Is x = 7 a solution to the equation 3x = 21? yes no WHICH ONE??

Mathematics
2 answers:
cricket20 [7]3 years ago
5 0

Answer:

Yes

Step-by-step explanation:

because when you plug in 7 it equals 21, so x=7 is a solution

Veronika [31]3 years ago
4 0

Answer:

yes.

Step-by-step explanation:

if you plug 7 into x it'll be 3x7 and that will equal 21

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108

Step-by-step explanation:

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3 years ago
A true-false question is to be posed to a husband and wife team. Both the husband and the wife will give the correct answer with
marysya [2.9K]

Answer:

Choose either strategy both are equally successful

Step-by-step explanation:

Given:-

- The probability of success for both husband (H) and wife (W) are:

                              P ( W ) = 0.8 , P ( H ) = 0.8

Find:-

- Which of the following is a better strategy for the couple?

Solution:-

Strategy 1

- First note that P ( W ) & P ( H ) are independent from one another, i.e the probability of giving correct answer of husband does not influences that of wife's.

- This strategy poses an event such that either wife knows the answer and answer it correctly or the husband knows and answers in correctly.

- We will assume that probability of either the husband or wife knowing the answer is 0.5 and the two events of knowing and answering correctly are independent. So,

                           P ( Wk ) = P (Hk) = 0.5

- The event P(S1) is:

                           P(S1) = P ( Hk & H ) + P ( Wk & W )

                           P(S1) = 0.5*0.8 + 0.5*0.8

                           P(S1) = 0.8

- Hence, the probability of success for strategy 1 is = 0.8

Strategy 2

- Both agree , then the common answer is selected otherwise, one of their answers is chosen at random.

- The success of strategy 2, will occur when both agree and are correct, wife is correct and answers while husband is not or husband is correct and he answers.

- The event P(S2) is:

                   P(S2) = P ( H & W ) + P ( H / W' & Hk ) + P ( H' / W & Wk )

                   P(S2) = P ( H & W ) + P ( H / W') P ( Hk ) + P ( H' / W) P (Wk)

                   P(S2) = P ( H & W ) + P ( H / W')*0.5  + P ( H' / W)*0.5

                   P(S2) = 0.5* [ P ( H & W ) + P ( H / W') ]  + 0.5* [ P ( H' / W) + P ( H & W )]

                   P(S2) = 0.5*P(H) + 0.5*P(W)

                   P(S2) = 0.5*0.8 + 0.5*0.8

                   P(S2) = 0.8

- Hence, the probability of success for strategy 2 is = 0.8

Both strategy give us the same probability of success.

                 

                       

4 0
3 years ago
Can someone solve number 6, and show your work plz
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Answer:

<em>3.9 kg</em>

Step-by-step explanation:

total mass = (number of nails) * (mass of one nail)

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iragen [17]

Answer:

5/2   = 2 1/2

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Step-by-step explanation:


5/2   2 goes into 5   2 times with 1 left over  = 2 1/2

15 /4   4 goes into 15 3 times with 3 left over  3 3/4

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3 years ago
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