Suppose p varies directly with d, and p = 3 when d = 5. What is the value of d when p = 12?
(Points : 4)

Question

Suppose p varies directly with d, and p = 3 when d = 5. What is the value of d when p = 12?
(Points : 4)

anonymous · Answer

@mathbrz

anonymous · Answer

do you know the basic formula for "direct variation"?
y = kx
p = kd
where k is constant.  So plug in your values for p and d to determine K
now use the original formula with K and solve for d if p is 12

anonymous · Answer

it would be 20?

anonymous · Answer

absolutely correct. Good Job!

anonymous · Answer

Given the function T(z) = z − 8, find T(−2).
(Points : 4)
       6
       10
       −10
       −6

anonymous · Answer

substitute -2 every time you see z

anonymous · Answer

idk what it would be

jdoe0001 · Answer

$\bf T({\color{red}{ z}}) = {\color{red}{ z}} − 8\qquad \qquad   T({\color{red}{ -2}})={\color{red}{ \square }}-8$

jdoe0001 · Answer

what do you think?

anonymous · Answer

i figured it out umm how about this
If f(x) = |x + 7|, find f(−12). 
(Points : 1)
       −5
       19
       5
       −19

anonymous · Answer

same way x = -12 
keep in mind your rules of absolute values

anonymous · Answer

-5

jdoe0001 · Answer

eep in mind your rules of absolute values    <---   
| value inside the bars, always comes out positive once the bars are removed |