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3 years ago

Find the product 12,-5

Mathematics

2 answers:

blagie [28]3 years ago

7 0

The answer is -60

Hope this helps and have a wonderful day :)

GREYUIT [131]3 years ago

3 0

When you multiply 12 by -5= You get -60.
$12 \times - 5 = - 60$

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Answer:

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Step-by-step explanation:

we know that

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$a_n=a_1+d(n-1)$

where

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$a_3=9$

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substitute

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The rule to find the sum of the the first n terms of the arithmetic sequence is equal to

$S=\frac{n}{2} [2a_1+(n-1)d]$

we have

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$S=42$

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substitute

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Solve the system of equations

$9=a_1+2d$ ----> equation A

$10.5=2a_1+7d$ ----> equation B

Solve the system by graphing

Remember that the solution is the intersection point both graphs

using a graphing tool

the solution is (14,-2.5)

see the attached figure

therefore

$a_1=14\\d=-2.5$

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Step-by-step explanation:

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