5b
5 minutes
aidan writes the counting numbers in order. in
row 1, he writes the first number. in row 2 he
writes the next two numbers, and so on as shown.
what is the thirteenth number in row 16?
row l: 1
ron 2: 2 3
row 3: 4 5 6
and so

133

Step-by-step explanation:

There will be 16 numbers in row 16.

Now, first number of each row are

So, the difference between the numbers is in the Arithmetic sequence.

Let,  S₁₆ = 1 + 2 + 4 + 7 + ............ + t₁₆

And S₁₆ =       1 + 2 + 4 + 7 + .......+ t₁₅ + t₁₆

(-) --------------------------------------------------------------

         0 = 1 + ( 1 + 2 + 3 + 4 + ...... up to 15 terms) - t₁₆ {Subtracting the equations}

⇒ t₁₆ = 1 + 0.5 (15)(15 + 1) = 121

Therefore, the first term of the 16th row is 121.

So, the 13th number of the 16th row will be = 121 + 12 = 133 (Answer)

spinning a 1, 2, or 3. option d.

step-by-step explanation: when spinning a number graph up to 4, and aiming for any number less than 3, that automatically eliminates the number 4. now you have two numbers to spin on that are less than 3, but the number 3 is included in this question because it's no greater of an number than itself. i hope this you : )

eve and marks ratios are equivalent

step-by-step explanation: