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Evaluate 
7j+5-8k when 
j=0.5 and 
k=0.25.

Evaluate 7j+58k7j+5-8k when j=0.5j=0.5 and k=0.25k=0.25.

Full solution

Q. Evaluate 7j+58k7j+5-8k when j=0.5j=0.5 and k=0.25k=0.25.
  1. Substitute Values: Substitute the given values of jj and kk into the expression.\newlineWe have j=0.5j=0.5 and k=0.25k=0.25, so we substitute these values into the expression 7j+58k7j+5-8k.
  2. Perform Multiplication: Perform the multiplication for each term with a variable.\newlineThis gives us 7×0.57 \times 0.5 for the term with jj, and 8×0.258 \times 0.25 for the term with kk.\newline7×0.5=3.57 \times 0.5 = 3.5\newline8×0.25=28 \times 0.25 = 2
  3. Replace Calculated Values: Replace the terms with their calculated values in the expression.\newlineThe expression now becomes 3.5+523.5 + 5 - 2.
  4. Perform Addition and Subtraction: Perform the addition and subtraction in the expression.\newlineFirst, we add 3.53.5 and 55, which gives us 8.58.5. Then we subtract 22 from 8.58.5.\newline8.52=6.58.5 - 2 = 6.5

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