Ineed im failing and i need to get my grade up what is the solution to -8* 5^√19x+15=-24 a. 11 b. 12 c. 0 d. 3 which answer is the solution to √2x-7-√x=1 a. 4 and 16 b. 16 only c. 4 only d. no solution

Appropriate math notation and parentheses would help immensely. As written, neither of these questions makes any sense.

1.

The solution is x=12.

2.

Square both sides of the equation:

... 2x -7 -2√(x(2x-7)) +x = 1

... 3x -8 = 2√(x(2x -7)) . . . . add 2√(x(2x-7)) -1

... 9x² -48x +64 = 4(2x² -7x) . . . . square both sides of the equation again

... x² -20x +64 = 0 . . . . add -8x²+28x

... (x -4)(x -16) = 0 . . . . factor the equation (one of many ways to find its roots)

... x = 4 or x = 16 . . . . values of x that make the factors 0

Try the solution x=4:

... √(2·4-7) -√4 = 1 - 2 ≠ 1 . . . . . not a solution

Try the solution x=16:

... √(2·16-7) -√16 = 5 -4 = 1 . . . . . is a solution

The only solution is x=16.

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Comment on the graph

Each of the equations has been recast to be of the form f(x) = 0, by adding the opposite of the right side of the equal sign. The graphing calculator highlights the zeros, so highlights the solution to the equation. You can see that the second equation (green graph) has only one solution.

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x