Please help me. question is "solve each system of linear equations by substitution"

please explain how you got the answer.

thank you very much you INTELLECTUALS

Which facts are true for the graph of the function below? check all that apply. f(x) = log8 x. (30 points pls )

Use this data in the problem below. follow the steps carefully. round to the nearest tenth. lot 3: week 1: 345 week 2: 340 week 3: 400 week 4: 325 step 1. jim enters the data and calculates the average or mean. step 2. jim calculates the deviation from the mean by subtracting the mean from each value. step 3. jim squares each deviation to remove negative signs. step 4. jim sums the squares of each deviation and divides by the count for the variance. step 5. jim takes the square root of the variance to find the standard deviation.

17 in long 1.3 ft wide and 8in high what is the volume