3 years ago

Twelve less than the one-fifth of a number is -7

1 answer:

3 0

1/5n - 12 = -7

or you can say

n/5 - 12 = -7

then if you solve...

n/5 - 12 = -7
+12 +12

n/5 = 5
times 5 on each side

n = 25

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The focal length F of a lens made by combining two lenses of focal length U and V is given I/F=I/U+I/V

jolli1 [7]

Answer:

a). $V=\frac{U.F}{U-F}$

b). V = 15 units

Step-by-step explanation:

Focal length F of a lens made by combining two lenses of different focal lengths U and V will be,

$\frac{1}{F}=\frac{1}{U}+\frac{1}{V}$

A). By solving the given formula,

$\frac{1}{V}=\frac{1}{F}-\frac{1}{U}$

$\frac{1}{V}=\frac{U-F}{U.F}$

$V=\frac{U.F}{U-F}$

B). If F = 6 and U = 10 then we have to find the value of V.

By substituting the given values in the formula,

$V=\frac{6\times 10}{10-6}$

$V=\frac{60}{4}$

V = 15 units

Therefore, focal length (V) of the lens = 15 units

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Which of these IS a Pythagorean triple? 11,60,62 6,8,15 5,11,12 18,80,82

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