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lora16 [44]
3 years ago
11

What is the sum of the multiples of 5 from 1 to 100, inclusive

Mathematics
2 answers:
olganol [36]3 years ago
7 0

answer is 20  just count how many times u add 5 to get to 100

Sladkaya [172]3 years ago
3 0

Answer:

1 x 5 = 5

2 x 5 = 10

3 x 5 = 15

4 x 5 = 20

etc

Step-by-step explanation:

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cos3A=cos(2A+A)=cos(2A)cosA-sin(2A)sinA.

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cos3A=(2c²-1)c-2c(1-c²)=c(4c²-3).

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Let t=tanA=s/c, then c²=1/(1+t²).

t=4c²-3=4/(1+t²)-3=(4-3-3t²)/(1+t²)=(1-3t²)/(1+t²).

So t+t³=1-3t², t³+3t²+t-1=0=(t+1)(t²+2t-1).

So t=-1 is a solution.

t²+2t-1=0 is a solution, t²+2t+1-1-1=0=(t+1)²-2, so t=-1+√2 and t=-1-√2 are solutions.

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A=-π/4, π/8, -3π/8 radians and these values +2πn where n is an integer.

Replacing π by 180° converts the solutions to degrees.

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