Let me analyze and solve each question in detail:

Question 1:

Subtract:
$(4y - 7) - (y - 7)$

Solution:

1. Distribute the negative sign to the second parenthesis:
   $(4y - 7) - y + 7$
2. Combine like terms:
   • For $y$: $4y - y = 3y$
   • For constants: $-7 + 7 = 0$

Final Answer:
$3y$

Question 2:

Rewrite the expression $13d - (-9d - 4)$ without parentheses.

Solution:

1. Distribute the negative sign to $(-9d - 4)$:
   $13d + 9d + 4$
2. Combine like terms:
   • For $d$: $13d + 9d = 22d$
   • The constant remains $+4$.

Final Answer:
$22d + 4$

Question 3:

A student received a coupon for 14% off the total purchase price at a clothing store. Let $c$ be the original price of the purchase. The expression $c - 0.14c$ represents the new price. Write an equivalent expression to show another way to represent the new price.

Solution:
Factor $c$ out from $c - 0.14c$:
$c(1 - 0.14)$ Simplify:
$c(0.86)$

Final Answer:
$0.86c$

Question 4:

Simplify the expression:
$(0.25n - 0.3) - (0.8n - 0.25)$

Solution:

1. Distribute the negative sign to the second parenthesis:
   $0.25n - 0.3 - 0.8n + 0.25$
2. Combine like terms:
   • For $n$: $0.25n - 0.8n = -0.55n$
   • For constants: $-0.3 + 0.25 = -0.05$

Final Answer:
$-0.55n - 0.05$

Question 5:

Each month, a shopkeeper spends $5x + 11$ dollars on rent and electricity. If he spends $2x - 3$ dollars on rent, how much does he spend on electricity?

Solution:

1. Total expense = Rent + Electricity:
   $5x + 11$ Rent = $2x - 3$
   Electricity = Total expense - Rent:
   $(5x + 11) - (2x - 3)$
2. Simplify:
   Distribute the negative sign:
   $5x + 11 - 2x + 3$ Combine like terms:
   • For $x$: $5x - 2x = 3x$
   • For constants: $11 + 3 = 14$

Final Answer:
$3x + 14$

Summary of Answers:

1. $3y$
2. $22d + 4$
3. $0.86c$
4. $-0.55n - 0.05$
5. $3x + 14$

Would you like detailed explanations for any specific question?

Here are 5 related questions to practice:

1. Simplify $(6a - 5) - (3a + 7)$.
2. Rewrite $15x - (-10x - 2)$ without parentheses.
3. Write an equivalent expression for $b - 0.25b$.
4. Simplify $(0.4y - 0.6) - (0.9y - 0.3)$.
5. A shopkeeper spends $6y + 8$ dollars, with $3y - 4$ on rent. How much does he spend on electricity?

Tip: Always distribute negative signs carefully when simplifying expressions!