A rate of change must be negative. A. True; rate of change is the same as slope and slope is always negative
B. False; y = x is a counterexample because it has a positive rate of change
C. True; the rate of change is a ratio of differences, so it is negative
D. False; y = −x is a counterexample because it has a negative rate of change

13

step-by-step explanation:

169-1=168

168-3=165

165-5=160

160-7=153

153-9=144

144-11=133

133-13=120

120-15=105

105-17=88

88-19=69

69-21=48

48-23=25

25-25=0

since it took 13times to completely subtract it hence its square root is 13

24

step-by-step explanation:

38.6°

step-by-step explanation:

resultant is 10 pound

smaller force = 8 pound

angle formed = tan⁻¹(

                        =tan⁻¹(

                          =tan⁻¹(0.8)

                        =38.6°