4. The circle x2 + y2 – 8x + 2y = 0 passes through the origin O. Line OA is a diameter to this circle.
In this question you must use detailed reasoning.
(i) Find the equation of the line 0 A, giving your answer in the form ax + by = 0, where a and b
are integers.
[5]
(ii) The tangent to the circle at point A meets the x-axis at the point B. Find the area of triangle
ОАВ.
[6]

answer: 1) twenty-seven times y

              2) twenty-seven multiplied by y

step-by-step explanation:

the shape,the size and the distance

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.

50-60=10

step-by-step explanation: