(b) Factorize: x2 - 49

(x+7)(x-7)

Step-by-step explanation:

This one has the standard shape of a²-b², therefore its factorization is (a+b)(a-b).

(x-7)(x+7)

Step-by-step explanation:

x^2 = x * x

-49 = -7 * 7

(x-7)(x+7)

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950