2 triangle+square=23
square=60/triangle
2 triangle+60/triangle=23
2 triangle^2+60=23 triangle
2 triangle^2-23 triangle+60=0
solving quadratic equation we get
triangle=15/2 , 4
15/2 is not possible so triangle=4
square=15
C, square root 3 over 2, because the angles are complementary
3/4x+3-2x=-1/4x+1/2x+5
3x+12-8x=-x+2x+20
-5x+12=x+20
-5x-x=20-12
-6x=8
-6x/-6=8/-6
X=8/-6
X=-4/3
Answer: There are 8 rows in the bookshelf. You do 1.5/0.1875=8 (1 1/2 / 3/16)
Answer 8 rows.
Hope this helps!
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Step-by-step explanation:
