Answer:
x=4/9
Step-by-step explanation:
We first let 0.4 (4 being repeated) be x.
10x=4.4
10x-x=4.4-0.4
9x=4
x=4/9
Answer:
98pie
Step-by-step explanation:
area of semicircle with radius 14units
=1/2(pie)(14)(14)
=98pie
Lets call x how wide it is, and write the area equation:
area = width*length
a = (x)(x + 5) = 20000
expand it:
x^2 + 5x = 20000
make a quadratic trinomial:
x^2 + <span>5x - 20000 = 0
</span>lets apply the general quadratic formula to solve:
x = (-5 +- √(25 + 80000))/2
x = (-5 +- 282.89<span>)/2
we take the positive solution:
</span>x = (-5 + 282.89<span>)/2
</span>x = 138.94
therefore the rectangle width is 138.94 m and <span>143.94 m long</span>
Perpendicular slope = -1/3
y = mx + b (-5,2)
2 = -1/3(-5) + b
2 = 5/3 + b
so
b = 2-5/3
b = 1/3
equation
y = -1/3x + 1/3
answer is B