Search our library of homework questions

Top answers

All subjects

All levels

If f(x) = 3x +x^2, what is f(-2)?

f(-2) = 3(-2) + (-2)²= -6 + 4 = 2First you need to substitute -2 for each value of x in the function. Then you need to simplify the expression by multiplying -2 by 3 and by squaring -2. (Hint...

Answered by William B. • Maths tutor

5082 Views

How do you structure an answer when describing a process such as the Kreb's Cycle?

Work chronologically, as you go through each step ask yourself, what, why , where , how questions?What is involved? - Pyruvic acid is converted to Acetly co-enzyme AWhy does it react?/ What conditions are...

Answered by Maegen F. • Biology tutor

2246 Views

Cells in Plant Roots do not Photosynthesise. State one reason why.

Plant roots are underground and therefore not exposed to sunlight, sunlight is needed for photosynthesisPlant roots do not have chloroplasts/chlorophyll, chloroplasts are need for photosynthesis

Answered by Sahana S. • Biology tutor

10115 Views

Describe how sucrose is loaded into the phloem (3)

Hydrogen ions are pumped out of companion cells using ATP.This creates a high concentration of hydrogen ions outside of the companion cell. H+ ions diffuse down their concentration gradient back into the ...

Answered by Divyadharshini R. • Biology tutor

7660 Views

How do I plan an exam essay?

Writing an essay is an art: it takes practice to perfect. But the key to writing good essays is proper preparation. Under exam time pressure, it can be tempting to skimp on planning and launch straight in...

Answered by Ollie C. • English tutor

2097 Views