3 years ago

Makiyha Martin

Mathematics

2 answers:

Aleks04 [339]3 years ago

6 0

Answer:

Step-by-step explanation:

janice got ripped off buying a computer for $780.

she could have easily built her own computer with similar specs for less money or use the same amount of money to build a way better pc.

GenaCL600 [577]3 years ago

3 0

Answer:

$31.20

Step-by-step explanation:

1. Calculate the tax amount. To do this, you multiply the price by the tax rate.

$780 x 4% = $31.20

The total tax paid was $31.20

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The half life of a radioactive kind of cadmium is 14 years. How much will be left after 28 years, if you start with 72 grams of

nlexa [21]

Answer:

18 grams

Step-by-step explanation:

8 0

3 years ago

Ad is tangent to circle o at d. find ab. round to the nearest tenth if necessary

Naddik [55]

Check the picture below.

$\bf 0=AB^2+6AB-121\implies \stackrel{\textit{using the quadratic formula}}{AB=\cfrac{-6 \pm \sqrt{6^2-4(1)(-121)}}{2(1)}}
\\\\\\
AB=\cfrac{-6 \pm \sqrt{520}}{2}\implies AB=\cfrac{-6 \pm \sqrt{4\cdot 130}}{2}
\\\\\\
AB=\cfrac{-6 \pm \sqrt{2^2\cdot 130}}{2}\implies AB=\cfrac{-6 \pm 2\sqrt{130}}{2}
\\\\\\
AB=-3\pm\sqrt{130}\implies AB=
\begin{cases}
\boxed{-3+\sqrt{130}}\\\\
-3-\sqrt{130}
\end{cases}$

since the distance AB cannot be a negative value, thus is not -3-√(130).