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Taya2010 [7]
3 years ago
8

An exterminator charges $80 to visit a home and $35 to spray each room. If the total bill was $395, how many rooms were sprayed?

(Use a variable)
Mathematics
1 answer:
melamori03 [73]3 years ago
8 0
9 rooms were sprayed. 395=80+35X
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NEED HELP HERE ASAP<br><br> 6. Find the cube roots of 27(cos 330° + i sin 330°).
VLD [36.1K]
<span>we have that

the cube roots of 27(cos 330° + i sin 330°) will be
</span>∛[27(cos 330° + i sin 330°)]

we know that
e<span>^(ix)=cos x + isinx
therefore
</span>∛[27(cos 330° + i sin 330°)]------> ∛[27(e^(i330°))]-----> 3∛[(e^(i110°)³)]
3∛[(e^(i110°)³)]--------> 3e^(i110°)-------------> 3[cos 110° + i sin 110°]

z1=3[cos 110° + i sin 110°]

 cube root in complex number, divide angle by 3
360nº/3 = 120nº --> add 120º for z2 angle, again for z3
<span>therefore
</span>
z2=3[cos ((110°+120°) + i sin (110°+120°)]------ > 3[cos 230° + i sin 230°]

z3=3[cos (230°+120°) + i sin (230°+120°)]--------> 3[cos 350° + i sin 350°]
<span>
the answer is 

</span>z1=3[cos 110° + i sin 110°]<span>

</span>z2=3[cos 230° + i sin 230°]

z3=3[cos 350° + i sin 350°]<span>

</span>
7 0
3 years ago
Hujknjk jk jjkjj help
notsponge [240]

Answer:

x≤ -7 or x≥ -4  

Step-by-step explanation:

There is a closed circle at -7 and the line goes to the left

x≤ -7  

There is a closed circle at -4 and the line goes to the right

x≥ -4  

Since they both can't be true at the same time it is an or

x≤ -7 or x≥ -4  

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What is 58.65 with a 15% tip?
11111nata11111 [884]
X/58.65 = 15/100

(58.65*15)/100 = tip
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