We read your photo as:

Given K = 1, 2, 3, ..., 11. (i) List the prime numbers in K. (ii) Find the probability that a number selected at random from the set K is not a prime number. 1. (b) Factorize completely: (x+y)(2m-n) -

Mathematics

ScanSolve AI Answer

Step-by-step solution

16 steps

Here are the solutions to the questions:

1. (a)
Given K={1,2,3,...,11}K = \{1, 2, 3, ..., 11\}.

  • (i) List the prime numbers in KK: A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. The prime numbers in KK are 2,3,5,7,112, 3, 5, 7, 11. The prime numbers are {2,3,5,7,11}\boxed{\{2, 3, 5, 7, 11\}}.

  • (ii) Find the probability that a number selected at random from the set KK is not a prime number:

  1. Determine the total number of elements in KK.

    There are 11 numbers in $K$.
    
  2. Determine the number of prime numbers in KK.

    From (i), there are 5 prime numbers.
    
  3. Determine the number of non-prime numbers in KK.

    Number of non-prime numbers = Total numbers - Number of prime numbers  
    Number of non-prime numbers $= 11 - 5 = 6$.
    
  4. Calculate the probability.

    $$
    P(\text{not prime}) = \frac{\text{Number of non-prime numbers}}{\text{Total number of numbers}}
    $$
    $$
    P(\text{not prime}) = \frac{6}{11}
    $$
    The probability is $\boxed{\frac{6}{11}}$.
    

    1. (b)
    Factorize completely: (x+y)(2m−n)−m(x+y)(x+y)(2m-n) - m(x+y)

  5. Identify the common factor.

    The common factor is (x+y)(x+y).

  6. Factor out the common factor.

    (x+y)(2m−n)−m(x+y)=(x+y)[(2m−n)−m](x+y)(2m-n) - m(x+y) = (x+y)[(2m-n) - m]
  7. Simplify the expression inside the square brackets.

    (x+y)(2m−n−m)=(x+y)(m−n)(x+y)(2m-n-m) = (x+y)(m-n)

    The completely factorized expression is (x+y)(m−n)\boxed{(x+y)(m-n)}.

    1. (c)
    A typist charges GH¢ 68.00 for the first 8 sheets typed, and GH¢ 11.00 for each additional sheet. Calculate the amount earned if the typist typed a total of 35 sheets.

  8. Calculate the number of additional sheets.

    Additional sheets = Total sheets - First 8 sheets
    Additional sheets =35−8=27= 35 - 8 = 27 sheets.

  9. Calculate the cost for the additional sheets.

    Cost for additional sheets =27 sheets×GH¢ 11.00/sheet=GH¢ 297.00= 27 \text{ sheets} \times \text{GH¢ } 11.00/\text{sheet} = \text{GH¢ } 297.00.

  10. Calculate the total amount earned.

    Total amount earned = Cost for first 8 sheets + Cost for additional sheets
    Total amount earned =GH¢ 68.00+GH¢ 297.00=GH¢ 365.00= \text{GH¢ } 68.00 + \text{GH¢ } 297.00 = \text{GH¢ } 365.00.
    The amount earned is GH¢ 365.00\boxed{\text{GH¢ } 365.00}.

    2. (a)
    The image of P(2,5)P(2, 5) when translated by the vector r=(−3,8)r = (-3, 8).
    A translation by vector (a,b)(a, b) means adding aa to the x-coordinate and bb to the y-coordinate.
    P′(x′,y′)=(x+a,y+b)P'(x', y') = (x+a, y+b).

    • (i) Find the image of P(2,5)P(2, 5):

      P′=(2+(−3),5+8)=(2−3,5+8)=(−1,13)P' = (2 + (-3), 5 + 8) = (2 - 3, 5 + 8) = (-1, 13)

      The image of P(2,5)P(2, 5) is (−1,13)\boxed{(-1, 13)}.

    • (ii) Find the image Q′Q' of Q(−4,−6)Q(-4, -6) when translated by rr:

      Q′=(−4+(−3),−6+8)=(−4−3,−6+8)=(−7,2)Q' = (-4 + (-3), -6 + 8) = (-4 - 3, -6 + 8) = (-7, 2)

      The image of Q(−4,−6)Q(-4, -6) is (−7,2)\boxed{(-7, 2)}.

    2. (b)
    Joyce and Richard contributed GH¢ 10,000.00 and GH¢ 5,000.00 respectively. Richard is paid one-third of the profit as a manager. The rest of the profit is shared in the ratio of their contributions. Total profit is GH¢ 9,000.00.

  11. Calculate Richard's manager's share.

    Richard's manager's share =13×GH¢ 9,000.00=GH¢ 3,000.00= \frac{1}{3} \times \text{GH¢ } 9,000.00 = \text{GH¢ } 3,000.00.

  12. Calculate the remaining profit to be shared.

    Remaining profit =GH¢ 9,000.00−GH¢ 3,000.00=GH¢ 6,000.00= \text{GH¢ } 9,000.00 - \text{GH¢ } 3,000.00 = \text{GH¢ } 6,000.00.

  13. Determine the ratio of contributions.

    Joyce's contribution : Richard's contribution =GH¢ 10,000.00:GH¢ 5,000.00=2:1= \text{GH¢ } 10,000.00 : \text{GH¢ } 5,000.00 = 2 : 1.
    Total ratio parts =2+1=3= 2 + 1 = 3.

    • (i) How much did Joyce receive? Joyce's share from remaining profit =23×GH¢ 6,000.00=GH¢ 4,000.00= \frac{2}{3} \times \text{GH¢ } 6,000.00 = \text{GH¢ } 4,000.00. Joyce received GH¢ 4,000.00\boxed{\text{GH¢ } 4,000.00}.

    • (ii) How much did Richard receive in total? Richard's share from remaining profit =13×GH¢ 6,000.00=GH¢ 2,000.00= \frac{1}{3} \times \text{GH¢ } 6,000.00 = \text{GH¢ } 2,000.00. Richard's total receive = Richard's manager's share + Richard's share from remaining profit Richard's total receive =GH¢ 3,000.00+GH¢ 2,000.00=GH¢ 5,000.00= \text{GH¢ } 3,000.00 + \text{GH¢ } 2,000.00 = \text{GH¢ } 5,000.00. Richard received in total GH¢ 5,000.00\boxed{\text{GH¢ } 5,000.00}.

    3. (a)
    Asana's original daily wage was GH¢ 25.00. Her daily wage increased by 10%. She worked for 30 days.

  14. Calculate the increase in daily wage.

    Increase =10% of GH¢ 25.00=0.10×GH¢ 25.00=GH¢ 2.50= 10\% \text{ of GH¢ } 25.00 = 0.10 \times \text{GH¢ } 25.00 = \text{GH¢ } 2.50.

  15. Calculate the new daily wage.

    New daily wage =GH¢ 25.00+GH¢ 2.50=GH¢ 27.50= \text{GH¢ } 25.00 + \text{GH¢ } 2.50 = \text{GH¢ } 27.50.

  16. Calculate the total amount she will be paid for 30 days.

    Total paid =New daily wage×Number of days worked= \text{New daily wage} \times \text{Number of days worked}
    Total paid =GH¢ 27.50×30=GH¢ 825.00= \text{GH¢ } 27.50 \times 30 = \text{GH¢ } 825.00.
    She will be paid GH¢ 825.00\boxed{\text{GH¢ } 825.00}.

    3. (b)
    The diagram shows the floor of a room with its dimensions.

    Let's determine the missing dimensions first:
    The total width is 8 m. The bottom segment is 5 m. So, the top inner horizontal segment is 8 m−5 m=3 m8 \text{ m} - 5 \text{ m} = 3 \text{ m}.
    The total height on the left is 5 m. The right vertical segment is 3 m. So, the bottom inner vertical segment is 5 m−3 m=2 m5 \text{ m} - 3 \text{ m} = 2 \text{ m}.

    • (i) Find the perimeter: The perimeter is the sum of all the outer sides. Perimeter =8 m+3 m+(8−5) m+(5−3) m+5 m+5 m= 8 \text{ m} + 3 \text{ m} + (8-5) \text{ m} + (5-3) \text{ m} + 5 \text{ m} + 5 \text{ m} Perimeter =8 m+3 m+3 m+2 m+5 m+5 m= 8 \text{ m} + 3 \text{ m} + 3 \text{ m} + 2 \text{ m} + 5 \text{ m} + 5 \text{ m} Perimeter =26 m= 26 \text{ m}. The perimeter is 26 m\boxed{26 \text{ m}}.

    • (ii) Find the area: We can divide the L-shaped floor into two rectangles. Method 1: Divide into a top rectangle and a bottom-left rectangle. Rectangle 1 (top): Length =8 m= 8 \text{ m}, Width =3 m= 3 \text{ m}. Area1=8 m×3 m=24 m2_1 = 8 \text{ m} \times 3 \text{ m} = 24 \text{ m}^2. Rectangle 2 (bottom-left): Length =5 m= 5 \text{ m}, Width =(5−3) m=2 m= (5-3) \text{ m} = 2 \text{ m}. Area2=5 m×2 m=10 m2_2 = 5 \text{ m} \times 2 \text{ m} = 10 \text{ m}^2. Total Area =Area1+Area2=24 m2+10 m2=34 m2= \text{Area}_1 + \text{Area}_2 = 24 \text{ m}^2 + 10 \text{ m}^2 = 34 \text{ m}^2.

      Method 2: Divide into a large left rectangle and a small top-right rectangle.
      Rectangle 1 (left): Length $=

Was this helpful?

Still stuck on this one?

Ask a follow-up, and the answer starts from this question.

Got a different question?Ask your own question
Handwritten step-by-step solution preview

Handwritten Step-by-Step Solution

Get this as a handwritten image on WhatsApp — like a tutor wrote it for you.

Try on WhatsApp