3 years ago

(ASAP 50 POINTS) If the aspect ratio of a chalkboard is 4:3 and the width is 12 in, what is the length of the chalkboard?

Mathematics

2 answers:

kvv77 [185]3 years ago

8 0

The answer is 6.67 i think

Mice21 [21]3 years ago

7 0

Answer: The length of the chalkboard is 9 inches.

Step-by-step explanation:

12/4= 4

3*3= 9

12:9 is equal to 4:3

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zvonat [6]

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3 years ago

Find the area of trapezoid JKLM. Round the answer to the nearest tenth.

maksim [4K]

from the diagram, we can see that the height or line perpendicular to the parallel sides is 8.5.

likewise we can see that the parallel sides or "bases" are 24.3 and 9.7, so

$\textit{area of a trapezoid}\\\\ A=\cfrac{h(a+b)}{2}~~ \begin{cases} h=height\\ a,b=\stackrel{parallel~sides}{bases}\\[-0.5em] \hrulefill\\ h=8.5\\ a=24.3\\ b=9.7 \end{cases}\implies \begin{array}{llll} A=\cfrac{8.5(24.3+9.7)}{2}\\\\ A=\cfrac{8.5(34)}{2}\implies A=144.5~in^2 \end{array}$