I can see the mathematical problems you uploaded. I will solve these questions for you. Let me start systematically.

Level 1

1. Solve these equations:

• (a) 3(x + 1) = 15
  Expand: $3x + 3 = 15$
  Solve for $x$:
  $3x = 15 - 3 = 12 \implies x = \frac{12}{3} = 4$ Answer: (a) $x = 4$

• (b) 2(x + 4) = -10
  Expand: $2x + 8 = -10$
  Solve for $x$:
  $2x = -10 - 8 = -18 \implies x = \frac{-18}{2} = -9$ Answer: (b) $x = -9$

• (c) 4x - 9 = 8
  Solve for $x$:
  $4x = 8 + 9 = 17 \implies x = \frac{17}{4}$ Answer: (c) $x = \frac{17}{4}$

• (d) -3(x - 1) = -12
  Expand: $-3x + 3 = -12$
  Solve for $x$:
  $-3x = -12 - 3 = -15 \implies x = \frac{-15}{-3} = 5$ Answer: (d) $x = 5$

2. Find the roots of these equations:

• (a) 3(y + 1) = 21
  Expand: $3y + 3 = 21$
  Solve for $y$:
  $3y = 21 - 3 = 18 \implies y = \frac{18}{3} = 6$ Answer: $y = 6$

• (b) 5(y - 4) = 25
  Expand: $5y - 20 = 25$
  Solve for $y$:
  $5y = 25 + 20 = 45 \implies y = \frac{45}{5} = 9$ Answer: $y = 9$

• (c) 7(y - 2) = 42
  Expand: $7y - 14 = 42$
  Solve for $y$:
  $7y = 42 + 14 = 56 \implies y = \frac{56}{7} = 8$ Answer: $y = 8$

• (d) 5(3x) = 60
  Solve for $x$:
  $15x = 60 \implies x = \frac{60}{15} = 4$ Answer: $x = 4$

Would you like me to continue solving Level 2 problems or any specific question?

Here are 5 related questions for practice:

1. Solve $4(2x - 5) = 12$.
2. Find the value of $x$ in $3(x - 4) + 2 = 11$.
3. Solve for $x$: $7(3x + 2) = 42$.
4. If $5(2y - 1) = 15$, what is $y$?
5. Solve $6x - 7 = 2x + 21$.

Tip: Always simplify and isolate the variable step by step!