Nikki spent one-half of her money for a shirt. Then she spent one-half of what she had left on a gift. She has $7.00 left. How much money did she spend?

Step-by-step explanation:

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Step-by-step explanation:

solution,

given,

Nikki spent 50% of her money for a shirt.

again she spent 25 % of her money.

here,

50% + 25% = 75%

100% - 75%= 25%

now,

25% = $7

multiplying both sides by 4

25% × 4 = $7 × 4

100% = $28

Her total money is $28

again, 75% of 28

= 75/100 × 28

28

so, she spent $ 28

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".