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:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

y=20x

: )

hope this