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ale4655 [162]
3 years ago
14

Solve the following problems: Given: ∆AFD, m ∠F = 90° AD = 14, m ∠D = 30° Find: Area of ∆AFD

Mathematics
1 answer:
ch4aika [34]3 years ago
4 0

We have the triangle 30° - 60° - 90°.

The sides are in proportion: 2 : √3 : 1

(look at the picture).

2a=14       <em>divide both sides by 2</em>

a=7

a\sqrt3=7\sqrt3

The area of a trinagle AFD:

A_{\Delta}=\dfrac{1}{2}(7)(7\sqrt3)=\boxed{\dfrac{49\sqrt3}{2}}

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If y varies directly as x and y = 21 when x = 5, find x when y = 42.
Lorico [155]

Answer: 10

<u>Step-by-step explanation:</u>

varies directly means: \frac{y}{x} = k

Step 1: solve for k   ⇒  \frac{21}{5} = k

Step 2: plug in the given value and k to solve for the missing value: \frac{42}{x} = \frac{21}{5}

42(5) = 21(x)

\frac{42(5)}{21} = \frac{21(x)}{21}

2(5) = x

10  = x


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3 years ago
Based on the table, which best predicts the end behavior of the graph of f(x)?
Yuki888 [10]

Answer: A. As x → ∞, f(x) → ∞, and as  x → –∞, f(x) → ∞.

6 0
3 years ago
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What is the justification for each step in solving the inequality?
Fed [463]

Step-by-step explanation:

3x+\frac{5}{8}\geq 4x-\frac{1}{2}

Subtract 5/8 on both sides

To subtract 5/8 we make the denominators same

3x\geq 4x-\frac{1*4}{2*4}-\frac{5}{8}

Addition or Subtraction property of order is used

3x\geq 4x-\frac{9}{8}

Subtract 4x on both sides

Addition or Subtraction property of order is used

-x\geq -\frac{9}{8}

Now divide both sides by -1

Multiplication or Division property of order is used

\frac{-x}{-1} \geq \frac{-\frac{9}{8}}{-1}

Multiplication or Division property of order is used

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5 0
3 years ago
Harry's spell casting class lasts 5/6 of an hour each day. Today, he has been in the class for 2/5 of an hour so far. How much m
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30 minutes are left in the class.
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3 years ago
How many solutions does this equation have?
kozerog [31]

Hello from MrBillDoesMath!


Answer: infinite solutions


Discussion: I did a double take on this one but  the left hand is

a + 3 + 2a =  3a +3

and the right hand side is

-1 + 3a + 4 = 3a + (4-1) = 3a + 3


The left and right sides of the equation are identical for all "a", i.e. for infinitely many "a" values.


Regards, MrB.







5 0
3 years ago
Read 2 more answers
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