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scoray [572]
3 years ago
7

Please help! and explain thank you!

Mathematics
2 answers:
ExtremeBDS [4]3 years ago
6 0

Answer:

D

Step-by-step explanation:

You want to move all terms not containing a to the right side of the equation.

Tju [1.3M]3 years ago
4 0

Answer:

B

Step-by-step explanation:

When you are solving these kinds of problems, it's always best to start with getting rid of the decimal/fraction.

--------------------------------------------------------------------------------------------------------------

We can actually solve for a.

2/3*3=6/3=2

(15+2a=-5)

a=-10

(15+(-20)=-5)

TRUE

a=10 (I think)

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Answer :

<h3>4^{10} <u> =1048576 ways </u> a student can answer the questions on the test if the student answers every question.</h3>

Step-by-step explanation:

Given that a multiple-choice test contains 10 questions and there are 4 possible answers for each question.

∴ Answers=4 options for each question.

<h3>To find how many ways  a student can answer the given questions on the test if the student answers every question :</h3>

Solving this by product rule

Product rule :

<u>If one event can occur in m ways and a second event occur in n ways, the number of ways of two events can occur in sequence is then m.n</u>

From the given the event of choosing the answer of each question having 4 options is given by

The 1st event of picking the answer of the 1st question=4 ,

2nd event of picking the answer of the 2nd question=4 ,

3rd event of picking the answer of the 3rd question=4

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10th event of picking the answer of the 10th question=4.

It can be written as  by using the product rule

=4.4.4.4.4.4.4.4.4.4

=4^{10}

=1048576

<h3>∴ there are 1048576 ways a student can answer the questions on the test if the student answers every question.</h3>
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