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solmaris [256]
3 years ago
6

If (a+b)(a-b)=21,a+b=7 and a-b=3 what Is the value of a

Mathematics
1 answer:
topjm [15]3 years ago
8 0

9514 1404 393

Answer:

  5

Step-by-step explanation:

Add the latter two equations and you get ...

  (a +b) +(a -b) = (7) +(3)

  2a = 10 . . . . . . . . . . . . . . . simplify

  a = 5 . . . . . . . divide by 2

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you only have $47. there is a tax rate of 4.6%. how much can you spend and still have enough to pay taxes
andrey2020 [161]
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4 0
3 years ago
The expression of (10w^3)^2/5w is equivalent to A) 2w^5 B) 2w^8 C) 20w^5 D) 20w^8
vovangra [49]
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3 years ago
A punch recipe that serves 24 people calls for 4 liters of lemon soda, 2 pints of sherbert, and 6 cups of ice. How much of each
Vitek1552 [10]
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8 0
3 years ago
Suppose your parents started saving for your college education when you were 5 years old. Assume they saved $300 the first year,
Aleonysh [2.5K]

Answer:

5850

Step-by-step explanation:

300+25x

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