1. £ 253,628.16
2. £ 350
3. 600,000 tickets
We will use compound growth formula for this, the formula is:
F is future amount (what we want to find after 2 yrs)
P is present amount (240,000)
r is the rate of increase (2.8% = 2.8/100 = 0.028)
t is the time in years (t = 2 given)
Substituting, we get our
The house would be worth £253,628.16 after 2 years
After the discount of 15%, he paid 297.50. So we can say:
What number, discounted by 15%, makes 297.50?
We can let that original price be "x" and write the equation as:
Originally, the laptop was worth £ 350
480,000 is 80% of the total number of tickets.
If we let total number of tickets be t, we can say:
480,000 is 80% (80/100 = 0.8) of WHAT NUMBER (t)??
Now, we can write an algebraic equation and solve:
The total number of tickets available was 600,000 tickets
Your answer will be that 18 is 22.5% of 80
Your answer will be that 75% of 320 is 240
i used to know how to do this in 7th but i forget easily
if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.
then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.
one way in which you can find the vertex is to calculate x = -b / (2a). here, that comes to
x = = 1. f(1) = 1^2 - 2(1) - 8 = - 9. vertex is at (1, -9).
find another point on the curve: let x=0, for which y=-8. then (0, -8) is on the curve. plot the vertex and this point and draw a smooth parabola thru both.