At the pool, Janae jumps off a diving board that is 15 feet high. Janae's height above the water is modeled by the function f (x) = -5x² + 10x + 15.
c) Janae made a perfect dive and entered the water hands first. After she surfaced and got
water, Janae wanted to know when she hit the water.
143 **
How can Janae find out WHEN her she first hit the water (how long was she in the air)? (You will be
asked to do the actual calculations in the next part of the problem.)
Janae's
diving path
EM POM
CONSULTES
ACAD
Test
Janae
Test Question
Surface of
pool water

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12

560

step-by-step explanation:

giggidy

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

idk

step-by-step explanation: