Given points O(0,0), A(4, 12), and B(-9,3), are OA and OB perpendicular?*
A. OA and OB are perpendicular because ala2+b1b2=0.
B. OA and OB are not perpendicular because a1 b1+ a2b270
C. OA and OB are perpendicular because al b1+ a2b2 =0.
D. OA and OB are not perpendicular because ala2+b1b280.
This is a required question

john got lost so he didn't know what to do and it was crazy because he didn't except it

step-by-step explanation:

123123 step byt step

answer:   28.56 feet (approx)

step-by-step explanation:

since, triangle abc has measure of angle c equal to 55 degrees, measure of angle abc equal to 90 degrees, and length of bc equal to 20 feet.

we have to find out the measurement of segment ab.

therefore, tan 55° =

but bc = 20 feet.

⇒ tan 55 ° =  

⇒ ab = 20 × tan 55 °

⇒ ab = 20 × 1.42814800674

⇒ ab = 28.5629601348   ≈ 28.56 feet

v,jhvljh,b.b; hk; ljujb,vuvccklokll; k,m,km,

step-by-step explanation: