T is to 9 as 7 is to 39

T = 21/13

Step-by-step explanation:

Step 1:  Make an expression

T is to 9 as 7 is to 39

Step 2:  Cross multiply

39(T) = 7(9)

39t = 63

Step 3:  Divide both sides by 39

39T / 39 = 63 / 39

T = 21 / 13

 T = 21/13

constant acceleration- a

constant velocity- c

no velocity or acceleration- b

explanation:

for body moving with a constant acceleration, the rate of change of displacement changes over time. this is proven by the increasing gradient of the curve (a) against time.

a body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient c.

a stationary body   covers no displacement as time elapses. thus the flat line with   zero gradient.