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cestrela7 [59]
2 years ago
15

James is five years older than David. The sum of their ages is 89. How old is David?

Mathematics
2 answers:
valentina_108 [34]2 years ago
7 0

Answer:

If james is 5 years old than David then

  1. subtract 5 from their sum of age
  2. Then divide the answer with 2
  3. There's the age of David

Ans is 42

Dafna1 [17]2 years ago
5 0

Answer:

Let David's age be x years

=>  James' age = x+5 years

David + James = 89

=> x + x+5=89

=> 2x=84

=> x=84/2=42 years

David's age is 42 years

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Solve and check the following equation algebraically. 1/2(x + 32) = -10
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Solve :
1/2(x + 32) = -10....multiply both sides by 2
x + 32 = -10 * 2
x + 32 = -20
x = -20 - 32
x = - 52 <===

check :
1/2(x + 32) = -10.....when x = -52
1/2(-52 + 32) = -10
1/2(-20) = -10
-20/2 = -10
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Rewriting it in quadratic form as:- x^2 -10x -4 = 0.

a = 1, b = -10, c = -4.

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x = ( 10 ± √(100 -4*1*-4) ) / (2*1)

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