3 years ago

Evaluate the following expression: -4xy when x = 1/4 and y = -3.

Mathematics

1 answer:

Travka [436]3 years ago

7 0

Answer:

Step-by-step explanation:

-4(1/4)(-3)= 3

Mark as brainlist.

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3 years ago

Application of Geometric Series

Gnoma [55]

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Step-by-step explanation:

The value of the summation is given by the formula ...

Sn = (a1)(1 -r^n)/(1 -r) . . . . . where a1 is the first of n terms, and r is the common ratio.

Your sum has first term and ratio ...

a1 = 2(0.6) . . . . . summation term for n=1

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So the sum is ...

$\displaystyle \sum_{n=1}^4{2(0.6^n)}=2(0.6)\dfrac{1-0.6^4}{1-0.6}=\dfrac{1.2}{0.4}(0.8704) = 2.6112$

Then the value of the entire given expression is ...

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_____

A calculator can help you find the value.

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