Hey !! what's the answer ??

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Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22