Is -10 -5 equal to -10+(-5)? explain in terms of additive inversed.

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Aball is dropped from a height of 10m above the ground. it bounce to 90% of its previous height on each bounce. what is the approximate height that the ball bounce to the fourth bounce?