8. $$ -15 m^{2} n^{4}-15 m^{2} n^{4} $$ 10. $$ 16 s+8 r-17 s $$

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UpStudy AI · Accepted Answer

Simplify the expression by following steps:
- step0: Solution:
  $$-15m^{2}n^{4}-15m^{2}n^{4}$$
- step1: Collect like terms:
  $$\left(-15-15\right)m^{2}n^{4}$$
- step2: Subtract the numbers:
  $$-30m^{2}n^{4}$$
Calculate or simplify the expression $$ 16 s+8 r-17 s $$.
Simplify the expression by following steps:
- step0: Solution:
  $$16s+8r-17s$$
- step1: Subtract the terms:
  $$-s+8r$$
Let's simplify the given expressions step by step.

### Problem 8: 
Expression: $$ -15 m^{2} n^{4} - 15 m^{2} n^{4} $$

1. **Combine like terms**: Both terms are identical, so we can add their coefficients.
   $$
   -15 + (-15) = -30
   $$
2. **Write the result**: The simplified expression is:
   $$
   -30 m^{2} n^{4}
   $$

### Problem 10: 
Expression: $$ 16 s + 8 r - 17 s $$

1. **Combine like terms**: The terms involving $$ s $$ can be combined:
   $$
   16s - 17s = -s
   $$
2. **Write the result**: The simplified expression is:
   $$
   -s + 8r
   $$

### Final Results:
- For Problem 8: $$ -30 m^{2} n^{4} $$
- For Problem 10: $$ -s + 8r $$
Simplified expressions: - $$ -30 m^{2} n^{4} $$ - $$ -s + 8r $$

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