Step-by-step explanation:
10. [-19-(-20) - (-34)] ÷ (-6)
= (-19+20+34) ÷ (-6)
= 35 ÷ (-6)
= -5.83
12. [-18 - (-66) -22] × 2
= [-18+66-22] × 2
= 26 × 2
= 52
Answer:
10. -35/6
12. 52
A notation like - (-6) can be written as +6 ("two times minus is plus").
So your question 10. becomes:
(-19 + 20 + 34) / -6, which is more pleasant to the eye.
Further simplifying gives you 35 / -6 which you should write as -35/6.
The next question, same principle:
(-18 + 66 - 22) * 2 = 26 * 2 = 52
The ratio is 30 : 9 = 10 : 3
2.25
25% is a quarter
therefore a quarter of 9 is
0.25×9
=2.25
