Can someone please help me i dont understand it

An = 12 -8(n-1)

Step-by-step explanation:

Here, we want to write an explicit rule

The nth term of an arithmetic sequence is;

Tn= a + (n-1)d

d is the common difference which is ;

4-12 = 12-20 = -8

The first term is 12

Substituting these values;

Tn = 20 + (n-1) -8

Tn = 20 -8n + 8

Tn = 28-8n

so, the correct option is;

An = 12 -8(n-1)

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,

a. turk and mcalister

b. howard, mission, and market

c. yes. since streets end some do not cross yet are not parallel to others. example: mcalister and 5th

step-by-step explanation:

parallel lines are lines which do not intersect ever and look a lot like railroad tracks. turk, mcalister and golden gate are examples of these.

intersect are streets which cross each other and a car on one can reach the other. howard, mission, and market intersect with 6th.

skew lines are lines which neither intersect nor are parallel. these lines exist here because some streets end and never intersect another like mcalister and 5th.