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3 years ago

What is the area of trapezoid ABCD?

Mathematics

2 answers:

n200080 [17]3 years ago

3 0

Answer: 90

i might be wrong

and hi

stiks02 [169]3 years ago

3 0

Answer:

Step-by-step explanation:

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the pitch, or frequency, of a vibrating string varies directly with the square root of the tension. if a string vibrates at a fr

Naily [24]

$\bf \qquad \qquad \textit{direct proportional variation}\\\\
\textit{\underline{y} varies directly with \underline{x}}\qquad \qquad y=kx\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\
\begin{array}{llll}
\stackrel{frequency}{f}\textit{ of a vibrating string varies directly}\\
\qquad \qquad \textit{with the square root of the tension }\stackrel{tension}{t}
\end{array}$

$\bf f=k\sqrt{t}\quad \textit{we also know that }
\begin{cases}
f=300\\
t=8
\end{cases}\implies 300=k\sqrt{8}
\\\\\\
\cfrac{300}{\sqrt{8}}=k\implies \cfrac{300}{\sqrt{2^2\cdot 2}}=k\implies \cfrac{300}{2\sqrt{2}}=k\implies \cfrac{150}{\sqrt{2}}=k
\\\\\\
\textit{and we can \underline{rationalize} it to }\cfrac{150\sqrt{2}}{2}\implies 75\sqrt{2}=k$

$\bf thus\qquad f=\stackrel{k}{75\sqrt{2}}\sqrt{t}\implies \boxed{f=75\sqrt{2t}}\\\\
-------------------------------\\\\
\textit{now, when t = 72, what is \underline{f}?}\qquad f=75\sqrt{2(72)}$

5 0

3 years ago

Read 2 more answers

How do you solve this problem?

Afina-wow [57]

Answer:

x=48

Step-by-step explanation:

x-3 15

------------ = ----------

6 2

We can use cross products to solve this problem

(x-3) *2 = 6*15

Distribute

2x-6 = 90

Add 6 to each side

2x-6+6 = 90+6

2x=96

Divide by 2

2x/2 = 96/2

x = 48

3 0

3 years ago

I need help .... can y’all help me

san4es73 [151]

6. C.

7. B.

8. B.

9. B.

10. C

3 0

3 years ago

Through: (-3, 3) and (0, -1)

Goshia [24]

Answer:

m=3/-4

Step-by-step explanation:

m= x(2)-x(1) / y(2)-y(1)=(0--3)/ (-1-3)=3/-4

7 0

2 years ago

8(4p+5)=8(5p-4) what’s the answer

prisoha [69]

Answer:

p= 9

Step-by-step explanation:

p= 9

6 0

2 years ago

Read 2 more answers