How did humans use rocks in the past?
a. to play sports
c. to write
b. to tell time
d. to make tools

Ineed with number 17 i don’t get it at alll

Choose the correct citation for the case which established the “minimum contacts” test for a court’s jurisdiction in a case. select one: a. brown v. board of education of topeka, 347 u. s. 483 (1954). b. international shoe co. v. washington, 326 u. s. 310 (1945) c. haynes v. gore, 531 u. s. 98 (2000). d. international shoe co. v. washington, 14 u. s. code 336. q

Pj conducts an experimental study on the effects of soft music during high stakes science testing. he randomly assigns students at the school. in one condition he does not provide music for testing while in the other group he does provide the music. he administers a pretest at the beginning of the year and a posttest at the end of the year. pj’s design is best described as a: a. static group comparisonb. pretest-posttest control group designc. control-group-time-series designd. nonrandomized control-group pretest-posttest design