Question

please answer me these three questions. I will mark you as brainliest....

Answer 1

7. The first one is easy you just need to convert it from mix fraction to fraction.

5×3+4/5=19/5

Dividing 19 by 5 we get: 3.8 (in decimal form)a

8.
$a = 1 + \sqrt{7}$
Then we need to find the value of -6/a. So all we need to do is place the value of a.

Placing value of a we get:

$- 6 \div 1 + \sqrt{7}$
NOW here the tricky part comes. This process is called rationalisation.
So the answer comes out to be 1-root7

9. In this question you just need to place the values given:

f(x)=5x^2-4x+5
f(1)=5(1)^2-4×1+5=6
f(-1)=5(-1)^2-4×(-1)+5=14
f(0)=5(0)^2-4×0+5=5
Therefore,
f(1)+f(2)+f(0)=6+14+5=25