ABC is a straight line
The length of AB is four times the length of BC.
AC = 75 cm
Work out the length of AB.

Length of AB = 60cm

Step-by-step explanation: ABC is a straight line

Let the length of AB and BC be x and y respectively

x = 4y

y = y

∴4y+y =75

5y=75

→y = 15

→x = 4y

∴x = 4×15 = 60cm

∴AB(x) = 60cm

∴BC(y) = 15cm

answer: okw

step-by-step explanation:

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,