Yes, very fun, not
ok
one way is table or
solutions amount x and y
x+y=500
x=25%
y=50%
0.25x+0.5y=0.35(500)
we have
x+y=500
0.25x+0.5y=0.35(500)
0.25x+0.5y=175
solve
multiply second equation by 100
25x+50y=17500
divide everybody by 25
x+2y=700
now we have
x+y=500
x+2y=700
multiply first equation by -1 and add to second equaiton
-x-y=-500
<u>x+2y=700 +</u>
0x+1y=200
y=200
sub
x+y=500
x+200=500
x=300
300L of the 25% and 200L of the 50%
You have to FOIL out the (x+4)(x-4) and then subrtract away the 9 in order to get a quadratic that you can solve for x. As it is, you can't do it.

Now if you move the 9 over with it, you get this:

which simplifies to

Now you can either solve this by recognizing that is the difference of perfect squares, or you can move the 25 over to the other side and take the square root of both sides, like this:


So the equation of a circle is (x - h)² + (y - k)² = r² where (h,k) are the coordinates of the center of the circle and r is the radius. The diameter of a circle is a line that goes from one point of the circle to the other through the center of the circle. Well the center would be midway through the diameter so use midpoint formula to find the center which is (h,k) Mid point formula is both given x's added together divided by 2 for h and both y coordinates added together divided by 2 to find k
(10+0)/2
10/2= 5
(12+2)/2
14/2 = 7
so the center of the circle is (5,7) now use distance formula using the center and one of the points to the radius
√((5-10)²+(7-12)²)
√(-5²+ -5²)
√(25 + 25)
√50 is the radius
Now plug all found information into circle equation
(x-5)² + (y-7)² =50 note the end is 50 because the circle equation is radius squared and since the radius is √50, radius² is 50.
Answer is c
The missing side lengths
6)B.15
7)A.8
Answer:
Part A) BD = 6.5 cm
Part B) see explanation
Step-by-step explanation:
See the attached figure
Part A) Find the length of BD
ΔDAB is a right triangle at A, AB is 3.3cm , DA is 5.6cm
So, DB is the hypotenuse
Using Pythagorean equation:
DB = √(AD² + AB²) = √(3.3² + 5.6²) = √42.25 = 6.5 cm
===================================================
Part B) Show that angle BCD is 90°
Given: CD is 5.2cm , BC is 3.9cm and DB = 6.5 cm
So, CD² = 5.2² = 27.04
BC² = 3.9² = 15.21
DB² = 6.5² = 42.25
So, CD² + BC² = 27.04 + 15.21 = 42.25 = DB²
So, DB represent a hypotenuse at ΔBCD
So, the apposite angle of BD is a right angle
So, ∠BCD = 90°