The width of the glass is 2.4
1) x^2=64 is the same as x=the root of 64 which gives us: (+-)8
2) here you must us pq-formel as:
5m^2-5m=60
5m^2-5m-60=0
(m^2-5m-60)/5=0
m^2-m-12=0
m=0,5(+-) the root of 0,25+12
m=0,5(+-)3,5
m1=0,5+3,5
m2=0,5-3,5
15) x^2=7x
x^2-7x=0 here there is two x, so:
x(x-7)=0
x1=0
x2=7
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Here you can only use PQ formula in all the others, just as I did in the question number 2</span>
Angle 2 and Angle B are both the same
180-50-65= 65 (angle sum of a triangle is 180 degrees) B = 65 degrees
180-50-65= 65 (angle sum on a straight line is 180 degrees) 2= 65 degrees
Thus Angle 2 and Angle B are both the same
Let's do the math, 2.5+2.5+2.5+2.5( 4times) is 10hrs+2.5= 12.5hrs