Mathematics, 03.12.2021 09:30, querline87
A wooden artifact from an ancient tomb contains 50 percent of the carbon-14 that is present in living trees.
How long ago, to the nearest year, was the artifact made? (The half-life of carbon-14 is 5730 years.)
years
Answers: 2
Mathematics, 21.06.2019 17:30, bazsinghnagoke
What is the number 321,000,000 in scientific notation? also what is the number? ?
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How to find the exponential function y=ca^x, with points (1,2) and (2,1)
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Mathematics, 21.06.2019 23:30, legendman27
Given: ad¯¯¯¯¯ is an altitude. prove: ab2+ac2=cb2 right triangle a b c with right angle a. point d lies on side b c and segment a d is drawn. angle a d c is a right angle. drag and drop a reason into each box to correctly complete the two-column proof. statement reason ad¯¯¯¯¯ is an altitude, and ∠bac is a right angle. given ∠adb and ∠adc are right angles. definition of altitude ∠bac≅∠bda ? ∠bac≅∠adc ? ∠b≅∠b ? ∠c≅∠c reflexive property of congruence △abc∼△dba ? △abc∼△dac aa similarity postulate abbd=cbab ? ab2=(cb)(bd) cross multiply and simplify. acdc=cbac polygon similarity postulate ac2=(cb)(dc) cross multiply and simplify. ab2+ac2=ab2+(cb)(dc) addition property of equality ab2+ac2=(cb)(bd)+(cb)(dc) substitution property of equality ab2+ac2=(cb)(bd+dc) ? bd+dc=cb segment addition postulate ab2+ac2=cb2 substitution property of equality
Answers: 1
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