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Mathematics

1 answer:

o-na [289]3 years ago

4 0

7)$25.50×.06=$1.53
$25.50+$1.53=$27.03
8)$66.30×.07=$4.64(actually $4.641 but have to round since it's money)
$66.30+$4.64=$70.94
9)$23.06×.065=$1.50(actually $1.4989 but have to round since it's money)
$23.06+$1.50=$24.56
10)$34.99×.0525=$1.84(actually $1.836975 but have to round since it's money)
$34.99+$$1.84=$36.83
11)$199.99×.0625=$12.50(actually $12.499375 but have to round since it's money)
$199.99+$12.50=$112.49
12)$130.25×.08=$10.42
$130.25+$10.42=$140.37

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Amanda got a new cell phone and used 95 text message in the first two weeks. In those two weeks, she had used 38% of her total m

Andreyy89

Answer:

Step-by-step explanation:

95 texts is 38% of her total messages.

95 = 0.38 × x

x = 95 / 0.38

x = 250

4 0

3 years ago

Solve the equation for the interval [0, 2π). 4 sin^2 x-1=0

prisoha [69]

$\bf 4sin^2(x)-1=0\qquad [0,2\pi )
\\\\\\
4sin^2(x)=1\implies sin^2(x)=\cfrac{1}{4}\implies sin(x)=\pm\sqrt{\cfrac{1}{4}}
\\\\\\
sin(x)=\pm\cfrac{\sqrt{1}}{\sqrt{4}}\implies sin(x)=\pm\cfrac{1}{2}
\\\\\\
\measuredangle x= sin^{-1}\left( \pm\cfrac{1}{2} \right)\implies \measuredangle x=
\begin{cases}
\frac{\pi }{6}\\\\
\frac{5\pi }{6}\\\\
\frac{7\pi }{6}\\\\
\frac{11\pi }{6}
\end{cases}$