4. There are two water tanks. Tank A and Tank B. At the onset of the situation, Tank A is empty and begins to be filled at a rate of 2 gallons per minute. At the same time, Tank Bhas in it, 140 gallons, and begins to be drained at a rate of 5 gallons per minute. Write a system of equations to model this situation, where x represents the minutes. Determine the number of minutes until the tanks have the same amount of water. How many gallons of water do each of the tanks have? ​

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Which mathematical statements are true? 1) if 3 is an odd number, then 3 times 3 is an even number. 2) if 6 is less than 7, then 4 is greater than 7. 3) six is divisible by 3, and 10 is a multiple of 2. 4) the average of the data is greater than the largest value in the data, or it’s less than the largest value in the data. 5) the slope of a linear graph is its rate of change, and the graph’s y-intercept is the initial value. 6) if an equilateral triangle has equal angles, then all its angles will measure 45°.

Polygon hh is a scaled copy of polygon gg using a scale factor of 1/4. polygon h's area is what fraction of polygon g's area?