A) Here is a number machine.
Input
Output
9
x2
+ 3
Work out the output when the input is 9.
b)
Here is the same number machine.
Input
Output
Work out the input when the output is 17.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Scarlet bought three pairs of sunglasses and two shirts for $81 and paula bought one pair of sunglasses and five shirts for $105 what is the cost of one pair of sunglasses and one shirt?

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.