If you were to randomly survey 50 people at 20 random locations across the country (such as parks, malls, restaurants, would this be a random sample? why or why not?

Yes, it is a valid random sample for if I were to randomly survey 50 people from the phone books of 20 randomly chosen cities.

Step-by-step explanation:

Because a random sample, means, the following: a subset of a statistical population in which each member of the subset has an equal probability of being chosen. And the randomly survey 50 people from the phone books of 20 randomly chosen cities matches this meaning.

Yes, it is a valid random sample for if I were to randomly survey 50 people from the phone books of 20 randomly chosen cities.

Although you might need more people to get a better percentage.

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