You multiply it together like (a+b)(a+b)
the answer would be a^2 + 2ab + b^2
Answer: Josh = 19.8 hours, Danny = 10.8 hours
<u>Step-by-step explanation:</u>


Since time cannot be negative, x=-5.8 is an extraneous solution (not valid) so x = 10.8
Josh: x + 9 --> 10.8 + 9 = 19.8
Danny: x --> 10.8
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2a) k = 9.45 & 0.55
2b) x = 3/2
2c) x = 2/3 <em>(x = -1 is an extraneous solution so is not valid)</em>
2d) No Solution <em>(x = 1 is an extraneous solution so is not valid)</em>
Here is the work for 2a. Follow this format for b, c, & d


Answer:
2000
Step-by-step explanation:
1600 is 100% - 20% = 80% of the original price.
So it is 4/5 of the original price.
So, the marked price is 1600 * 5/4 = 2000
This can’t be solved you have no variable and two equal signs as it is written
Answer:
18
Step-by-step explanation:
3x + 2 = 6x - 4
6 = 3x
2 = x
3(2) + 2 + 6(2) - 4 + 2
8 + 8 + 2
18