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Hello!

The answer would be d = 10. Solve it like this. (v v v)

10 * 0 + 4 * d = 40 ---> 0 + 4 * 10 = 40

0 + 40 = 40

40 = 40

Hope this helps! ☺♥
JonHenderson55
Answer:  " d = 10 " .
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Explanation:
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Given:  " 10c + 4d =40"  ;  Solve for "d" ; when:  "c = 0" ;
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Plug in "0" for "c" ; and simplify:
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  10(0) + 4d = 40 ;
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    0 + 4d = 40 ; 
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          4d = 40 ;
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Divide each side of the equation by "4";  to isolate "d" on one side of the equation; & to solve for "d" ;
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    4d / 4  = 40 / 4 ; 

to get:
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        d = 10 .
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