(√x + 2)(√x - 2) = 0. find X

x=4

Step-by-step explanation:

there are two answers of x, but X is not negative under the root sign

so x=4

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.