Which of the following cannot be derived from the law of sines?
a.) b/sinb=sina/a
b.) a*sinb=b*sina
c.) sinc/sina=c/a
d.) c*sina=a*sinc

Step-by-step explanation:

Sine Rule =

a)

Sine rule is  

Thus Option 1 cannot be derived from the law of sines

b)

Sine rule is  

Thus Option B can be derived from the law of sines.

c)

Sine rule is  

Thus Option C can be derived from the law of sines.

d)

Sine rule is  

Thus Option C can be derived from the law of sines.

Hence Option A cannot be derived from the law of sines

she drove 134 miles

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15