Let A be an m times n matrix. Explain why the equation Upper A Bold x equals Bold b has a solution for all b in set of real numbers R Superscript m if and only if the equation Upper A Superscript Upper T Baseline Bold x equals Bold 0 has only the trivial solution.

-7

step-by-step explanation:

x^2 + 18x + 74 = (x + 9)^2 - 81 + 74

= (x + 9)^2 - 7.

so q = -7.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m

-60.75

step-by-step explanation:

just add the numbers then put the negative sign on it

answer: you will have more water.