Answer:
BC would be 8.
Step-by-step explanation:
40 x 0.2 = 8
(Try graphing on a number line)
In order to figure this out, we can set up a proportion and simplify using cross multiplication.

One grapefruit costs
89 cents.
Suppose we let
, so that
.
Also, recall the double angle identity for cosine:

So, we can rewrite and compute the integral using the substitution, as





The length of the support post is 40 ft.
<u>Solution:</u>
Given, the height of the wall is 20 ft; support post forms 30 degree
Refer the attached image
Let us name the triangle as ABC where AB is the wall (opposite side) of 20 ft and
is 30 degree (
) and AC is the length of the post.
To find: The length of the post (AC)
we know the formula,
(trigonometric formula)
On substituting the values we get,

The value of sin 30 degree is 0.5

Answer: This is how I would do it 8x67=402
Step-by-step explanation: