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brookerebman15
16.07.2019 •
Mathematics
Arectangle has an area of 256 cm 2 . it has a width that is 48 cm shorter than 4 times its length. what is the rectangle's length?
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Ответ:
x--------> the rectangle's length
y-------> the rectangle's width
we now that
Area of rectangle=x*y
Area=256 cm²
256=x*y-------> equation 1
y=4x-48------> y=4x-48------> equation 2
substitute equation 2 in equation 1
256=x*[4x-48]-----> 256=4x²-48x
4x²-48x-256=0
using a graph tool----> to resolve the second order equation
see the attached figure
the solution is
x=16 cm
y=4x-48----> y=4*16-48-----> y=16 cm
is a square
the answer is
the rectangle's length is 16 cm
Ответ:
26°
Step-by-step explanation:
The angle with 66° which is shown with a red line is the sum of y and 40° so to find the value of y
we subtract 40 from 66 which gives us result as 26°.