2*pi*R should be substituted in. 2*13*3 = 78
Answer:
the 2 answers are x= 1.2, -1.2 but the answer has to be 1.2
sorry couldn't provide work
Answer:
i can barely see the qeustions
For number 12 do a proportion. 0.5 over 100 and x over 650 and then u cross multiply and divide and get 3.25. For number 14 do the same thing but the opposite way. You put x over 100 to find the percent and 2 over 1000 which is 0.2%.
Answer:
Decimal Places
1.6962 = 1.70 (2 d.p)
0.4247 = 0.425 to 3 d.p
0.007395 = 0.007 to 3 d.p
0.007395 = 0.0074 (4 d.p)
Significant Figures
32 549 = 32 500 (3 s.f)
32 549 = 32 550 (4 s.f)
909 520 = 910 000 (3 s.f)
909 520 = 909 500 (4 s.f)
Hope this helps :)