Since 
, you have
Since
, and 
, you know that 
is also positive, which means
Since
Estimating a decimal sum or difference Estimate 18.71 +5.149 by first rounding each number to the nearest tenth.
1 answer:
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It's best to think of oddly shaped polygons as different simple shapes within itself. You can divide them into two rectangles, solve for their areas separately, then add them together. (Halves slip horizontally)
6*11 would be the top half, which equals 66 square units
It is not given the amount of units long the longest side is, but you can figure it out by adding the sides given above. (7, 11, and 6)
5*24 would be the bottom half; 120 square units
Add both areas together to get the overall area of the polygon given
66+120=186
I'm assuming that ? is a minus sign
3x+4y-8=0
a.
perpendicular lines have slopes that multiply to -1
ok
for ax+by-c=0
the slope is -a/b
so
3x+4y-8=0
slope=-3/4
perpendicular lines have slopes that multiply to get -1
-3/4 times what=-1
times both sides by -4/3
what=4/3
the slope is 4/3
y=mx+b
m=slope
b=y intercept
y=4/3x+b
we are given the point (2,3)
x=2 and y=3
3=4/3(2)+b
3=8/3+b
3-8/3=b
9/3-8/3=b
1/3=b
y=4/3x+1/3 is the equation
b. the slope is 4/3
c. the y intercept is 1/3
d. see attachment
3x+4y-8=0
a.
perpendicular lines have slopes that multiply to -1
ok
for ax+by-c=0
the slope is -a/b
so
3x+4y-8=0
slope=-3/4
perpendicular lines have slopes that multiply to get -1
-3/4 times what=-1
times both sides by -4/3
what=4/3
the slope is 4/3
y=mx+b
m=slope
b=y intercept
y=4/3x+b
we are given the point (2,3)
x=2 and y=3
3=4/3(2)+b
3=8/3+b
3-8/3=b
9/3-8/3=b
1/3=b
y=4/3x+1/3 is the equation
b. the slope is 4/3
c. the y intercept is 1/3
d. see attachment