this has to do with a expression and variable math question . this is the problem i need to write . the directions to the question is. WRITE A EXPRESSION. CHOOSE A VARIABLE FOR THE UNKNOWN. Karen had 30 problems to do for homework. She did some before dinner and 21 after dinner ?
2006-10-31 14:59:44 · 5 answers · asked by coonazzgal 2 in Education & Reference ➔ Homework Help
30= x + 21
x is the unknown because the problem leaves you not knowing how many problems she did before dinner.
2006-10-31 15:03:32 · answer #1 · answered by jamilu 2 · 0⤊ 0⤋
If you take the unknown variable as "x" then the expression would be x+21=30.You are at liberty to choose any variablelike a.b.p.q or y .in each of the cases change the variable from the above expression and you get your answer like a+21=30 or b+21=30 or p+21=30 and so on
2006-11-01 00:12:20 · answer #2 · answered by alpha 7 · 0⤊ 0⤋
30 problems = some problems + 21 problems
just rename some to x
30 problems = x problems + 21 problems
30 = x + 21 or 30 - 21 = x
2006-10-31 23:10:32 · answer #3 · answered by abryanb 2 · 1⤊ 0⤋
Let x be the number done before dinner.
x + 21 = 30
2006-10-31 23:04:56 · answer #4 · answered by Anonymous · 1⤊ 0⤋
She did (some before dinner) and (21 after dinner)
..........................x.................. +......... 21............ = 30
x + 21 = 30
2006-10-31 23:07:06 · answer #5 · answered by Helmut 7 · 0⤊ 0⤋