Since the first two numbers have the same radical, they can be combined. 
-3√7-3√7=-6<span>√7
Simplify -2</span>√32 to get -8<span>√2.
So simplified, you would get -6</span>√7-8<span>√2.</span>
        
             
        
        
        
Answer:
1416 cm
Step-by-step explanation:
Use calcutor shows everthinh
 
        
             
        
        
        
Answer:
f(x) = -60 is your answer
Step-by-step explanation:
Plug in 3 for x
f(x) = 5x² - 7(4x + 3)
f(x) = 5(3²) - 7(4(3) + 3)
Follow PEMDAS. First, solve the parenthesis
3² = 9
4(3) + 3 = 12 + 3 = 15
f(x) = 5(9) - 7(15)
Multiply
f(x) = 45 - 105
Simplify. Subtract
f(x) = 45 - 105
f(x) = -60
f(x) = -60 is your answer
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<span>
-4c - 11 = 4c +21                                        add 4c to both sides
</span>
<span>
-4c - 11 + 4c = 4c + 21 + 4c                        simplify
- 11 = 8c + 21</span>                                <span>               subtract 21 from both sides
- 11 - 21 = 8c + 21 - 21                                </span><span>simplify
- 32 = 8c                                                      divide both sides by 8
c = - 4That's it
</span>
I hope you got
the idea