Which could be the first step in solving the equation represented by the model below?
xx x
✓x
O Add 4 positive unit tiles to each side.
O Remove 4 unit tiles from each side.
Add 6 positive unit tiles to each side.
O Remove 6 unit tiles from each side.

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 33 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30 ∘c on monday, but decreased at a constant rate in the next 33 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.