How to write two subtraction equations to show how to find 15-7

When you flip a biased coin the probability of getting a tail is 0.6. How many times would you expect to get tails if you flip the coin 320 times?

4 teachers decide to swap desk at work. How many ways can this be done if no teacher is to sit at their previous desk?

What is - 22.2 x (-6.1) ? A. - 135.42 B. - 28.3 C. 28.3 D. 135.42

Two-thirds a numer plus 4 is 7

What is the divisibility rule for 9? Is 118 divisible by 9?

Y = 3x + 1 Y = x + 5 Solving systems of equations

What is the best way to convert metric units (I'm really bad at this ...)

4x^2 + 3 (3 - 3x^2)

In a boat race, Maggi and Jagriti start off together. Maggi rowed the boat at 4 km/h and Jagriti rowed at a speed of 6 km/h. By how many kilometres was Maggi lagging behind Jagriti after 2 hours.

Stephanie is registering her son for swim lessons. There is a one-time $45 registration fee plus a $20 fee per lesson. Stephanie paid a total of $225. For how many lessons did Stephanie register?