Identify the irrational sum(s). select all that apply. (my second and last question! )

a) √9 + √7
b) 2.25 + 6
c) √16 + 1/2
d) 10 + π

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Find the value of x in each case. give reasons to justify your solutions! d q ∈ pr

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g