Urgent help plz. The expression -140 + 20m represents a submarine that began at a depth of 140 feet below sea level and ascended at a rate of 20 feet per minute. What was the depth of the submarine after 4 minutes? could you help with the math part too?

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

On new year's day, the average temperature of a city is 5.7 degrees celsius. but for new year's day 2012, the temperature was 9.8 degrees below the average. i) if a represents the average temperature on new year's day and 7 represents the temperature on new year's day 2012, what formula accurately relates the two values together? ii) what was the temperature on new year's day 2012? dt a 0.8 ii) - 4 1 degrees celsius da-t-98 ii) 59 degrees celsius 1) 7 = -9,8 11) 59 degrees celsius ii) l degrees celsius

What is the expression in factored form? -20x^2 - 12x a. 4x(5x+3) b. -4x(5x-3) c. -4(5x+3) d. -4x(5x+3)