Out of 30 questions, ahmad answer 12 of them incorrectly. what percent of the questions did he answer correctly?

Which value is not a solution of 8x^3 – 1 = 0

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect

Which fraction represents the ratio 35 : 42 in simplest form