Maths with David

9 December

👉🏼How long is y in the diagram below?

👈🏼Estimate the value of $\sqrt{\frac{50.77}{0.513}}$

👆🏼A full water tank springs a leak, at the base, and loses 8% of its contents each minute. What percentage of water is lost over 5 minutes?

👇🏼(ax+1)(x-3)(x+b) = 2x3 – 3x2 – 8x – 3. Find a and b.

🖐🏼Ashok buys a car for £3400 and sells it later in the year for £3800. Calculate his percentage profit.