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oksano4ka [1.4K]
3 years ago
7

Sam painted the walls shown. He took 12 hours to paint the walls. If Sam took the same amount of time to paint each wall, how lo

ng did he take to paint 1 wall?
Mathematics
1 answer:
maksim [4K]3 years ago
5 0
How many walls are there ?
what answers are shown to choose from ?
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What is the solution to the equation? square root -2x-5-4=x A. -7 and -3 B. 3 and 7 C. -3 D. 7
Alexxx [7]

Answer:

3

Step-by-step explanation:

step1 Isolate the square root on the left hand side

    Original equation

    √2x-5-4 = -x

    Isolate

    √2x-5 = 4-x

step2 eliminate the radical on the left hand side

    Raise both sides to the second power

    (√2x-5)2 = (4-x)2

    After squaring

    2x-5 = x2-8x+16

step3 Solve the quadratic equation

    Rearranged equation

    x2  - 10x  + 21 = 0

    This equation has two rational roots:

      {x1, x2}={7, 3}

step4 Check that the first solution is correct

    Original equation, root isolated

    √2x-5 = 4-x

    Plug in 7 for  x  

     √2•(7)-5 = 4-(7)

     Simplify

     √9 = -3

     Solution does not check

     3 ≠ -3

step5 Check that the second solution is correct

    Original equation, root isolated

    √2x-5 = 4-x

    Plug in 3 for  x  

     √2•(3)-5 = 4-(3)

     Simplify

     √1 = 1

     Solution checks !!

    Solution is:

     x = 3

3 0
2 years ago
Which expression represents: the product of 7 and the sum of 3 times a number n and 5?
Dmitrij [34]

Answer:

7(3n+5)

Step-by-step explanation:

4 0
3 years ago
What is the rule for the pattern 1,5,17 missing number and 161?
kifflom [539]
The pattern is you multiply by 3, and add 2, so the missing number would be 53
6 0
3 years ago
Need this answer for this
Alexandra [31]

Answer:

the point (0,6) is the point that is 1/6 of the way

5 0
2 years ago
(How to calculate (-2,8) and (1,6) that =-2/3
Pavel [41]
(6-8)/(1+2)= -2/3 the answer to the question
3 0
3 years ago
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