3 years ago

If David has test average of 80, Homework average of 90, and the final exam score of 71,

Mathematics

2 answers:

kumpel [21]3 years ago

7 0

B bc that math adds up right

olga nikolaevna [1]3 years ago

7 0

Answer:

C) 83

Step-by-step explanation:

Calculate each average by the percentage weight, then add up the results.

0.40 (80) + 0.45 (90) + 0.15 (71)

= 32 + 40.5 + 10.65

= 83.15

Rounded to the nearest point, his final grade is 83.

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3 years ago

In a circle with a diameter of 25.2 ft. An arc is intercepted by a central angle of 168°. What is the arch length? Use 3.14 for

ss7ja [257]

if the circle has a diameter of 25.2, its radius is half that or 12.6.

$\bf \textit{arc's length}\\\\ s=\cfrac{\pi \theta r}{180}~~ \begin{cases} r=radius\\ \theta =angle~in\\ \qquad degrees\\ \cline{1-1} r=12.6\\ \theta =168 \end{cases}\implies s=\cfrac{\pi (168)(12.6)}{180} \\\\\\ s=11.76\pi \implies \implies \stackrel{\pi =3.14~\hfill }{s=36.9264}\implies \stackrel{\textit{rounded up}}{s=36.93}$

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3 years ago

HELP PLEASE I NEED HELP

Vesna [10]

$C. \: 8 \sqrt{3}$ ✅

Step-by-step explanation:

$\sqrt{192} \\ = \sqrt{2 \times 2 \times 2 \times 2 \times 2 \times 2 \times 3} \\ = \sqrt{ {2}^{2} \times {2}^{2} \times {2}^{2} \times 3} \\ = \sqrt{ {8}^{2} \times 3 } \\ = 8\sqrt{3}$