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Tutor profile: Liana R.

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Liana R.
Civil Engineer with more than 12 years Experience as a Professional Tutor
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Questions

Subject: Pre-Calculus

TutorMe
Question:

abs Value( 3x -7) +7 = 9

Inactive
Liana R.
Answer:

abs Value( 3x -7) =2 3x-7 = 2 or 3x-7= -2 3x=9 or 3x=5 x=3 or x=5/3

Subject: Trigonometry

TutorMe
Question:

sqrt(2) * csc(x) +2 =4 Solve for the angle x

Inactive
Liana R.
Answer:

sqrt(2) * csc(x) = 2 csc(x) = 2/ sqrt(2) Sin(x) = sqrt(2)/2 x= pi/4 , 3pi/4 + 2npi

Subject: Algebra

TutorMe
Question:

Ross Labs needs to make 3200 gallons of 42% acid solution. They have 36% acid solution and 54% solution. How many gallons of each type are needed to make 3200 gallons of the 42% acid solution?

Inactive
Liana R.
Answer:

x+y= 3200 ------> y=3200-x 0.36x + 0.54y = 0.42(3200) 0.36x + 0.54( 3200-x) =0.42(3200) 0.36x + 1728 -0.54x = 1344 -0.18x=-384 x=2133.33 y=1066.67 36% acid is 2133.33 gal 42% acid is 1066.67 gal

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