#### Answer

a. 24.5 psi
b. approx. 485.71 seconds

#### Work Step by Step

We have the formula P = 35 - 0.07s, where P = pressure and s = seconds.
For question "a":
P = 35 - 0.07s
P = 35 - 0.07 × 150
P = 35 - 10.5
P = 24.5
For question b:
P = 35 - 0.07s
1 = 35 - 0.07s
-34 = -0.07s
s = 485.714286...
So, to the nearest hundredth, s = 485.71.