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List the prime numbers in K = 1, 2, 3, ..., 11. (b) Factorize completely: (x+y)(2m-n) - m(x+y).
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27 steps1. (a)
- (i) List the prime numbers in .
Recall the definition of a prime number.
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
Identify prime numbers within the set .
The prime numbers in $K$ are $\boxed{\text{2, 3, 5, 7, 11}}$.- (ii) Find the probability that a number selected at random from the set is not a prime number.
Determine the total number of elements in set .
The set $K = \{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11\}$, so there are 11 elements.Determine the number of prime numbers in .
From part (i), the prime numbers are $\{2, 3, 5, 7, 11\}$, which is 5 prime numbers.Determine the number of non-prime numbers in .
Number of non-prime numbers = Total numbers - Number of prime numbers $$ = 11 - 5 = 6 $$Calculate the probability.
$$ P(\text{not prime}) = \frac{\text{Number of non-prime numbers}}{\text{Total number of numbers}} = \frac{6}{11} $$ The probability is $\boxed{\frac{6}{11}}$.1. (b) Factorize completely: .
Identify the common factor in both terms.
The common factor is $(x+y)$.Factor out the common term.
$$ (x+y)(2m-n) - m(x+y) = (x+y)[(2m-n) - m] $$Simplify the expression inside the square brackets.
$$ (x+y)(2m-n-m) = (x+y)(m-n) $$ The completely factorized expression is $\boxed{(x+y)(m-n)}$.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.
Calculate the number of additional sheets.
Total sheets typed = 35 sheets. Sheets covered by the initial charge = 8 sheets. Additional sheets = $35 - 8 = 27$ sheets.Calculate the cost for the additional sheets.
Cost per additional sheet = GH¢ 11.00. Cost for additional sheets = $27 \times \text{GH¢ } 11.00 = \text{GH¢ } 297.00$.Calculate the total amount earned.
Cost for first 8 sheets = GH¢ 68.00. Total amount earned = Cost for first 8 sheets + Cost for additional sheets $$ = \text{GH¢ } 68.00 + \text{GH¢ } 297.00 = \text{GH¢ } 365.00 $$ The amount earned is $\boxed{\text{GH¢ } 365.00}$.2. (a) The image of P(2, 5) when translated by the vector is (-3, 8). Find:
- (i) .
Let the original point be and the image be .
Let the translation vector be .
Use the translation formula
.
Solve for and .
$$ a = -3 - 2 = -5 $$ $$ b = 8 - 5 = 3 $$ The translation vector $r$ is $\boxed{\begin{pmatrix} -5 \\ 3 \end{pmatrix}}$.- (ii) the image Q' of Q(-4, -6) when translated by .
Let the original point be and the translation vector be from part (i).
Use the translation formula
.
Calculate the coordinates of .
$$ Q' = \begin{pmatrix} -4 + (-5) \\ -6 + 3 \end{pmatrix} = \begin{pmatrix} -9 \\ -3 \end{pmatrix} $$ The image $Q'$ is $\boxed{(-9, -3)}$.2. (b) Joyce and Richard contributed GH¢ 10,000.00 and GH¢ 5,000.00 respectively to start a business. They agreed that Richard will be paid one-third of the profit as a manager and the rest of the profit will be shared in the ratio of their contributions. If the profit of GH¢ 9,000.00 was made, how much did:
- (i) Joyce receive;
- (ii) Richard receive in total?
Calculate Richard's manager's share.
Total profit = GH¢ 9,000.00. Richard's manager's share = $\frac{1}{3} \times \text{GH¢ } 9,000.00 = \text{GH¢ } 3,000.00$.Calculate the remaining profit to be shared.
Remaining profit = Total profit - Richard's manager's share $$ = \text{GH¢ } 9,000.00 - \text{GH¢ } 3,000.00 = \text{GH¢ } 6,000.00 $$Determine the ratio of contributions.
Joyce's contribution : Richard's contribution = GH¢ 10,000.00 : GH¢ 5,000.00 $$ = 10,000 : 5,000 = 2 : 1 $$ The sum of the ratio parts is $2 + 1 = 3$.Calculate Joyce's share from the remaining profit.
Joyce's share = $\frac{2}{3} \times \text{GH¢ } 6,000.00 = \text{GH¢ } 4,000.00$. Joyce received $\boxed{\text{GH¢ } 4,000.00}$.Calculate Richard's share from the remaining profit.
Richard's share = $\frac{1}{3} \times \text{GH¢ } 6,000.00 = \text{GH¢ } 2,000.00$.Calculate Richard's total earnings.
Richard's total = Richard's manager's share + Richard's share from remaining profit $$ = \text{GH¢ } 3,000.00 + \text{GH¢ } 2,000.00 = \text{GH¢ } 5,000.00 $$ Richard received in total $\boxed{\text{GH¢ } 5,000.00}$.3. (a) Asana was engaged to collect cashew-fruits on a farm and was paid a wage of GH¢ 25.00 a day. If the daily wage increased by 10% and she worked for 30 days, how much will she be paid?
Calculate the increase in daily wage.
Original daily wage = GH¢ 25.00. Increase = 10% of GH¢ 25.00 = $0.10 \times \text{GH¢ } 25.00 = \text{GH¢ } 2.50$.Calculate the new daily wage.
New daily wage = Original daily wage + Increase = GH¢ 25.00 + GH¢ 2.50 = GH¢ 27.50.Calculate the total amount paid for 30 days.
Total payment = New daily wage $\times$ Number of days worked
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