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perlalimas7372
23.06.2019 •
Mathematics
Find an equation for the line that passes through the point (-3,7) and is perpendicular to 3x-5y=80. give your answer in point-slope form. show as much work as possible to support your answer.
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Ответ:
y-7=-(5/3)(x+3)
Step-by-step explanation:
step 1
Find the slope of the line that is perpendicular to 3x-5y=80
we have
3x-5y=80
5y=3x-80
y=(3/5)x-16
The slope of the given line is m1=3/5
Remember that
If two lines are perpendicular, then the product of their slopes is equal to -1
so
m1*m2=-1
Find m2
(3/5)*m2=-1
m2=-5/3
step 2
Find the equation of the line into point slope form
y-y1=m(x-x1)
we have
m=-5/3
point (-3,7)
substitute
y-7=-(5/3)(x+3) > equation of the line into point slope form
Ответ:
828 small spheres can be made from the metal.
Step-by-step explanation:
Side of the cube = 4.5cm
Volume = (a x a x a)
= (4.5 x 4.5 x 4.5)
= 91.125 cubic cm
Radius of the sphere = 3mm = 0.3 cm
Volume of 1 sphere = (4/3) π(r x r x r)
= (4/3) (3.14) (0.3 x 0.3 x 0.3)
= (4/3) (3.14) (0.027)
= 0.34/3
= 0.11 cubic cm
No. of spheres = 91.125/0.11
= 828.4
So, 828 small spheres can be made from the metal.