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 one year ago
A large asteroid crashed into a moon of a planet, causing several boulders from the moon to be propelled into space toward the planet. Astronomers were able to measure the speed of one of the projectiles. The distance (in feet) that the projectile traveled each second, starting with the first second, was given by the arithmetic sequence 29, 40, 51, 62, . . . Find the total distance that the projectile traveled in seven seconds.
339 feet
405 feet
434 feet
182 feet
 one year ago
A large asteroid crashed into a moon of a planet, causing several boulders from the moon to be propelled into space toward the planet. Astronomers were able to measure the speed of one of the projectiles. The distance (in feet) that the projectile traveled each second, starting with the first second, was given by the arithmetic sequence 29, 40, 51, 62, . . . Find the total distance that the projectile traveled in seven seconds. 339 feet 405 feet 434 feet 182 feet

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Kagome_gurl8
 one year ago
Best ResponseYou've already chosen the best response.1i think its a but i'm not sure...

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0use the formula Sn = n(2a1 + d(n1))/2 where in this case a1 = 29 (first term) d = 11 (common difference) n = 7 (number of terms you want to sum)

genius12
 one year ago
Best ResponseYou've already chosen the best response.0I TRIED TO DERIVE ALL OF MATHEMATICS BUT FAILED...

Kagome_gurl8
 one year ago
Best ResponseYou've already chosen the best response.1I am still very confused...

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0Sn = n(2a1 + d(n1))/2 S7 = 7*(2*29 + 11(71))/2 S7 = ???

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0you're welcome
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