Mount everest is over 2.9 x 10^4 feet tall. in standard form that is

29,000

Step-by-step explanation: The number shown here 2.9 × is written in scientific notation since it's composed of a decimal between 1 and 10 in this case 2.9 and a power of 10 in this case . to write this number in standard notation, we first begin with 2.9. Next, we look at the exponent which in this case is positive 4 so this tells us to move the decimal point 4 places to the right. Finally, we fill in the missing positions with zeroes and we have the number 29,000.

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".