5 + (- 7) + 9 (- 11) + 13 + (- 15) + 17 + (- 19) + 21 + (- 23)

5 + (- 7) + 9 (- 11) + 13 + (- 15) + 17 + (- 19) + 21 + (- 23)

5+(-7)+9(-11)+13+(-15)+17+(-19)+21+(-23)
=(5-7)+(9-11)+(13-15)+(17-19)+(21-23)
=-2-2-2-2-2
=-10
If you don't understand this question, you can ask,

Three and a half × (- 4) - 3 ÷ (- 5) divided by 0.25 × (- 2 two thirds)

Three and a half × (- 4) - 3 ÷ (- 5) divided by 0.25 × (- 2 two thirds)
=-7/2x4-3÷5÷0.25x8/3
=-14-12/5x8/3
=-14-32/5
=-14-6.4
=-20.4

What is the quotient of the sum of three fourths of 12 and half of 6

[12*(3/4)+6]/(1/2)=30

Three quarters of a number is 25 more than half of it. What's the number?

25÷（3/4-1/2）
=25÷1/4
=100