If the sum of 5 consectuive positive integers is w, in terms of w, which of the following represents the sum of the next 5 consecutive positive integers?

If  $ab=40$  ,  $\frac{a}{b}=\frac{5}{2}$  , and a and b are whole numbers, find the value of a. 

Isabella must take four 100-point tests in her math class. Her goal is to acheive an average grade of 95 on the tests. Her first two test scores were 97 and 91. After seeing her score on the third test, she realized she can still reach her goal. What is the lowest possible score she could have made on the third test?

A shop advertieses everything is "half price in today's sale." In addition a coupon gives a 20% coupon discount on sale prices. Using the coupon, the price today represents what percentage of the original price?

What is the units digit of $13^{2020}$ ?

Write an expression to represent how many cubes are in the nth picture in the sequence.

We live in a base 10 system which means we use 10 digits to write numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9). When we run out of digits, we move into the next place value.

Binary is base 2 which means there are only two digitis (0, 1). Just like our base system, when you run out of digits you go to the next place value. So 0 in binary is 0 in base 10. 1 in binary is 1 in base 10. And 10 in binary is 2 in base 10 since we had to move to the next place value.

Using this understanding, how do you write 8 in binary?

We live in a base 10 system which means we use 10 digits to write numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9). When we run out of digits, we move into the next place value.

Binary is base 2 which means there are only two digitis (0, 1). Just like our base system, when you run out of digits you go to the next place value. So 0 in binary is 0 in base 10. 1 in binary is 1 in base 10. And 10 in binary is 2 in base 10 since we had to move to the next place value.

Using this understanding, the number 10111 when converted back to base 10 is what number?