1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ivahew [28]
3 years ago
13

Help with trigonometry​

Mathematics
1 answer:
diamong [38]3 years ago
4 0

Answer:

cos ∠CBD = - 4√41 / 41

Step-by-step explanation:

AB = 4      ΔABC = (4 x AC) / 2 = 10

AC = 5

BC = √5² + 4² = √41

cos ∠CBD = cos (180° - ∠CBA) = cos 180° cos ∠CBA + sin 180° sin ∠CBA

(cos 180° = - 1          sin 180° = 0       cos ∠CBA = 4 / √41 )

cos ∠CBD = (-1) x cos  ∠CBA = - 4 / √41 = - 4√41 / 41

You might be interested in
Need help with this math​
IgorLugansk [536]
<h2>Answer: 6 gallons </h2>

First we are told that we initially had 1/3 of the tank and when 10 gallons were added we had 3/4 of the tank:

\frac{1}{3}+10gallons=\frac{3}{4}    (1)

10gallons=\frac{3}{4}-\frac{1}{3}   (2)

1gallon=\frac{1}{24}    (3)

This means 1 gallon is equivalent to 1/24 tank.

On the other hand if we have 3/4 of a tank and need to reach 1 tank we have to add another fraction of the tank:

\frac{3}{4}+X=1   (4)

X=\frac{1}{4}   (5)>>>>This is the fraction needed to complete 1 tank

Now we need to know <u>how much that 1/4 tank is equivalent in gallons</u>.

From (3) we know 1gallon=\frac{1}{24} . So, we can write the following relation to transform from fractions of a tank to gallons:

\frac{1}{4}.\frac{1gallon}{\frac{1}{24}}=(\frac{1gallon}{4})(\frac{24}{1})

\frac{24}{4}gallons=6gallons

Therefore:

<h2>6 more gallons are needed to fill the tank</h2>
8 0
4 years ago
Evaluate The Expression 3(× - 1)² +2× - 7 for × = 3
jeyben [28]

\bf 3(x-1)^2+2x-7\implies \stackrel{\stackrel{x=3}{\cfrac{}{}}}{3[(3)-1]^2+2(3)-7}\implies 3[2]^2+6-7 \\\\\\ 3[4]+(-1)\implies 12-1\implies 11

6 0
4 years ago
Read 2 more answers
A book sold 33,200 copies in its first month. Suppose this represents 7.4% of the number of copies sold to date. How many copies
Marta_Voda [28]

Answer: 448648

Step-by-step explanation:

33,200 copies represent 7.4% of the total amount

-----------------------------------------------------

#1  33,200 ÷ 7.4%

- this is because how we get 33,200 by calculation is use the total amount and times 7.4% to get 33,200. So we are just working backwards. Since it was times before, then we divide after.

 33,200÷7.4%

=33,200÷0.074

≈448648 (you can't round up when the real amount is less the exact amount)

6 0
3 years ago
Read 2 more answers
What is the solution to the inequality -8x + 4 &lt; -4?
never [62]

Answer:

x > 1

General Formulas and Concepts:

<u>Pre-Algebra</u>

  • Equality Properties

Step-by-step explanation:

<u>Step 1: Define</u>

-8x + 4 < -4

<u>Step 2: Solve for </u><em><u>x</u></em>

  1. Subtract 4 on both sides:                    -8x < -8
  2. Divide -8 on both sides:                       x > 1

Here we see that any value <em>x</em> greater than 1 would work as a solution.

6 0
3 years ago
HELP ME PLEASE
lesantik [10]
Use a ABC Indy and then you get doneBottle rocket launched what it what was the company’s profit was a
3 0
3 years ago
Other questions:
  • PLZ help solve this !!!
    13·1 answer
  • Ten Points For First To Answer Correctly
    12·1 answer
  • Select all equations that have the same solution as 3x - 12=24
    13·1 answer
  • Question 7 (1 point)
    10·1 answer
  • The table shows how much each fift grade room earned from a bake sale.The money is going to be given to 6 charities.If each Char
    14·1 answer
  • Mrs. Jean said that 4/12 of the test items are multiple choice, 5/12 or short answer and the rest are matching. What fraction of
    11·1 answer
  • Mrs. Torres is mailing a package that weighs 12.5 pounds. The post office charges by the
    11·1 answer
  • Helppp me and please explain
    14·1 answer
  • The ratio of length to breath of a room is 7:5, find the length is the breath is 10cm
    13·1 answer
  • Quadrilateral A B C D is translated up and to the right and then is rotated 180 degrees about point Q to form quadrilateral X Y
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!