3 years ago

If a varies inversely with b, and a=20 when b=14, find the equation that relates a and b.

Mathematics

1 answer:

Arte-miy333 [17]3 years ago

4 0

Answer:

ab = 280

a = 280/b

Step-by-step explanation:

Inverse variation is of the form

xy = k

Since we have a and b as our variables

ab = k

20 *14 = k

280 = k

ab = 280

Sometimes they write it as

a = 280/b

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The two ends of this triangular right prism are equilateral triangles. The

maria [59]

If the two ends of this triangular right prism are equilateral triangles. The surface area of the prism is 74cm.

<h3>Surface area</h3>

Using this formula

A=bh+L(S1+S2+S3)

Where:

L=5cm

b=4cm

h=3.5cm

S1=4cm

S2=4cm

S3=4cm

Let plug in the formula

A=4(3.5)+5(4+4+4)

A=14+5(12)

A=14+60

A=74 cm

Therefore the surface area of the prism is 74cm.

Learn more about surface area here:brainly.com/question/16519513

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7 0

2 years ago

Answer 1/5d + 1/8d=2

klemol [59]

$\frac{1}{5}d+\frac{1}{8}d=2\\\\
Make\ common\ denominator\ of\ \frac{1}{5}\ and\ \frac{1}{8}\ which\ is\ 40:\\\\
\frac{8}{40}d+\frac{5}{40}d=2\ \ \ |*40\\\\8d+5d=2*40\\\\
13d=80\ \ |:13\\\\d=\frac{80}{13}=6\frac{2}{13}\\\\
Answer\ is\ d=6\frac{2}{13}.$