The box 13.7 the ratio of image brightness to the source brightness equations 13.16 and 13.15 imply that 14.10.|10, where ao, -(1tre ) 4=bab (13.19) we also have 0,= (bvb + 40, ) from equation 13.14. the claim in equation 13.17 is that the above imply that t-pe. p; 1012) 317) exercise 13.7.1. verify that this is correct. exercise 13.7.2. verify that this ratio is always positive. (hint: argue that for any positive x, x+ (1/x) –220.)

The primary benefit of taking into account a child's interests while selecting exercise activities is that the child will a. play more willing with others b. succeed at their favorite activity c. allow parents to relax afterwards d. gain motivation to exercise select the best answer from the choices provided.

Which of the following is not a characteristic of s waves? a. travel slower than p waves. b. cannot be detected in locations more than 105° from an earthquake’s epicenter. c. travel through solids and liquids. d. only affect coastal regions.

Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1