Which of these expressions have negative values? Select all that apply. 2 + 2(-3)(7) ?

-2(27 ÷ 9)+4 ?

(14 ÷ -2)(-6) ?

(4 - 10) - ( 8 ÷ ( -2) ?

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Can you me find the missing length. i attached an image.