Exam Questions
3
Elijah runs a go-kart track. It takes 12 litres of petrol to our
race 8 go-karts for 20 minutes. Petrol costs £1.37 per litre.
a) 6 go-karts used 18 litres of petrol. How many minutes did they race for?

17.78 minutes

Step-by-step explanation:

Given that;

It takes 12 liters of petrol to our  to race 8 go-karts for 20 minutes at a costs of £1.37 per liter, form a table as;

Liters of petrol         go-kart races     minutes        cost per minute

12                                 8                         20                  1.37

18                                  6                        ?                      1.37

Perform cross-product as;

=12*8*20*1.37)/18*6*1.37

=2630.4/147.96

=17.78 minutes

step-by-step explanation:

which of the following statements correctly describes the expression below based on its degree and number of terms?

314 - 7x2 + 11

-3

step-by-step explanation:

a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3