Bobby's cat runs x mph. Bobby's dog runs twice as fast as his cat. How far can Bobby's cat run in 30 minutes?

Bobby's cat can run 0.5x miles in half an hour.

Step-by-step explanation:

If the cat can run x mph, that means in half an hour, he can run 0.5x, because 30 minutes is half of an hour, and therefore half of x.

And just in case, his dog can run x miles in half an hour. (2x times 0.5 of an hour).

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0