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Mathematics

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salantis [7]3 years ago

3 0

Answer:

since u said u have the answer now im just doin this 4 points so hiiiiiiiiiiiiiiiii..... lol

Step-by-step explanation:

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3. If the circumference of a circle is 44 m, find its area.<br><img src="https://tex.z-dn.net/?f=%5Cpi" id="TexFormula1" title="

Natali5045456 [20]

Answer:

$\huge\blue{ \mid{ \underline{ \overline{ \tt ♡ ANSWER : ♡ }} \mid}}$

Circumference of the circle = 44 m

Circumference Formula = 2πr

Let's take the radius as 'r' m.

Radius (r) =

$2πr = 44 \\ 2 × 3.14 × r = 44 \\ r = 44/6.28 \\ r = 7 \: m.$

Area of the circle = πr²

$= 3.14 × 7² \\ = 153.86 \: m ^{2}$

=> Area of the circle = <u>153.86 m² = 154 m² (approx.)</u>

8 0

3 years ago

Train a is 14 mph slower than train B. Train A travels 220 miles in the same time train B travels 290 miles. Find the speed of b

djverab [1.8K]

Recall your d = rt, distance = rate * time

if say train B has a speed of "r", then A has a speed of "r-14".

now, they each travelled those miles in the same time, say "t" hours.

$\bf \begin{array}{lccclll}
&\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\
&-----&---&----\\
\textit{Train A}&220&r-14&t\\
\textit{Train B}&290&r&t
\end{array}
\\\\\\
\begin{cases}
220=t(r-14)\\
290=rt\implies \frac{290}{r}=\boxed{t}\\
----------\\
220=\boxed{\frac{290}{r}}(r-14)
\end{cases}
\\\\\\
220=\cfrac{290(r-14)}{r}\implies 220r=290r-4060\implies 4060=70r
\\\\\\
\cfrac{4060}{70}=r\implies 58=r$

how fast is Train A? well, r - 14.

7 0

3 years ago

The dimensions of Sara's apartment are22 1/2 feet by 25 feet. In the scale drawing below,1 1/2 inches is equivalent to 15 feet.

expeople1 [14]

Answer:

Step-by-step explanation:

Given:

The scale 1 1/2 ( $\frac{3}{2}$ ) inches = 15 feet