3 years ago

PLEASE HELP ME GUYS!!

Mathematics

1 answer:

Softa [21]3 years ago

8 0

Answer:

n=20

Step-by-step explanation:

$S_{n} =\frac{n(a_{1}+a_{n})}{2}\\\\1260 =\frac{n(25+101)}{2} \\\\n = 20$

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Otrada [13]

Answer:

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Step-by-step explanation:

Base area: B

Base is triangle

base = 12 ft and height = 5 ft

Area of triangle = B = $\frac{1}{2}* \ base * \ height$

$= \frac{1}{2}*12 * 5\\\\= 6 * 5\\\\= 30 \ ft^{2}$

H = 20 ft

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= 30 * 20

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