Please help. 50 points + brainliest 1. Combine the following expressions.
a√x + b √y - c√x

2. Combine the following expressions.
4m + 5√n - m + 6m - 3√n

3. Combine the following expressions.
√16a - √49a + √81a

4. Combine the following expressions
a√125y - b √45y

(NOTICE: If you do not know the answer, please do not answer. Trolls seeking points will be reported).

1. (a-c) + b

2. 9m + 2

3. 6a

4. (5a - 3b)

Step-by-step explanation:

1. since a and c share the same squareroot x, you can combine these together.

2. First add like terms together. 4m - m + 6m = 9m. Then 5 and -3 combined equals 2

3. First simplify the square roots. squareroot of 16 is 4. square root of 49 is 7. square root of 81 is 9. They are all multiplied by a in the expression. Thus 4a - 7a + 9a = 6a

4. First simplify the radicals, they are not perfect. square root of 125 is equivalent to sqrt(25 * 5), which sqrt of 25 is 5, but we keep the sqrt of 5. For sqrt of 45, it is the same as sqrt9 * sqrt5. sqrt of 9 is the same as 3 and we keep sqrt 5. Thus we get the below:

5a - 3b

We can combine the two like terms and get the final answer above.

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step-by-step explanation:

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.