How can u use mental math to multiply 800 x 5

You can use mental math because you know that 8x5 is 40 so u add in two more zeros because there are still two zeros in 800 to get 4000. Hope this helps! :)

answer: 2x + 2 − 2 = 10 − 2; subtraction property of equality

step-by-step explanation:

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