Write and simplify the following mathematical expressions: a) 5 subtracted from the sum of 8 and 7. b) 7 added to the product of 5 and 6. c) 9 subtracted from the product of 7 and 3. d) 8 added to the

$$15 - 5 = 10$$ $$\boxed{10}$$

b) 7 is added to the product of 5 and 6.

$$30 + 7 = 37$$ $$\boxed{37}$$

c) 9 is subtracted from the product of 7 and 3.

$$21 - 9 = 12$$ $$\boxed{12}$$

d) 8 is added to the quotient of 36 divided by 4.

$$9 + 8 = 17$$ $$\boxed{17}$$

e) The product of 7 and the quotient of 40 divided by 5.

$$7 \times 8 = 56$$ $$\boxed{56}$$

7. Let's simplify these mixed operations.

a) $27 \div 3 \times 4 + 12 - 5$

$$43$$ $$\boxed{43}$$

b) $48 \div 8 \times 7 + 5 - 10$

$$37$$ $$\boxed{37}$$

c) $10 \times 9 + 63 \div 7 - 20$

$$79$$ $$\boxed{79}$$

d) $40 + 4 \times 3 - 32 \div 8$

$$48$$ $$\boxed{48}$$

e) $35 - 12 + 6 \times 36 \div 4$

$$77$$ $$\boxed{77}$$

f) $8 \times 5 - 15 + 10 \times 27 \div 9$

$$55$$ $$\boxed{55}$$

g) $3 + 8 \times 72 \div 8 - 10 - 5$

$$60$$ $$\boxed{60}$$

h) $15 - 6 + 7 \times 63 \div 9 - 4$

$$54$$ $$\boxed{54}$$