Prove the sum of two rational numbers is rational where a, b, c, and d are integers and b and d cannot be zero. steps reasons 1. a over b plus c over d given 2. ad over bd plus cb over bd multiply to get a common denominator 3. simplify fill in the missing step in the proof. ad times cb all over bd ad plus cb all over bd ad minus cb all over bd ad plus cb all over two times bd

All per-unit concepts rely on ratios, meaning, to provide a type of measurement

Which is the scale factor proportion for the enlargement shown?

Astudent is determining the influence of different types of food on the growth rate of spiders. she feeds one group of spiders two caterpillars twice a week. the other group received similarly-sized beetles twice a week. she records the amount of time required for individuals to reach sexual maturity. her hypothesis is that the spiders feeding on caterpillars will have a faster growth rate because caterpillars have a higher protein content compared to beetles. in this experiment, what is the dependent variable? spiders assigned to different feeding groups. time required to reach sexual maturity number of prey items fed twice a week. growth rates of each group.