Noha, Sarah, and Karima are sisters. Noha is 3 years older than Sarah. Sarah is 2 years older than Karima, who is 20 years old. How old is
Noha ?

25 years old

Step-by-step explanation:

karima is 20 years old

Sarah is 2 years older than karima (20+2= 22)

Noha is 3 years older than Sarah

if sara is 22 then noha is 22+3=25

answer: the answer is 40.82

step-by-step explanation: 3.14 x 13(or half of 26) to the power of 2

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".