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How are red blood cells adapted to carry out their function?

Contain haemoglobin - a molecule that can bind reversibly to oxygen. Biconcave disk shape - increases surface area to allow more diffusion of oxygen. No nucleus - allows more space for haemoglobin. Flexible ...
LC
Answered by Lily C. • Biology tutor
11945 Views

Jack has 20 sweets. Will also has 20 sweets. Jack gives Will x sweets. Jack then eats 5 of his sweets. Will then eats half of his sweets. Write expressions for the number of sweets Jack and Will now have.

They both start with 20 sweets. To get the total number of sweets that Jack has, you need to take away x because that is the amount that he gives to will. Jack then eats 5 of his sweets so you need to take a...
LM
Answered by Lucy M. • Maths tutor
5691 Views

There are 420 balls in a ball pool. There is a combination of violet, blue, yellow and green balls. 2/7 are violet, 35% are blue and the ratio of yellow to green is 4:5. How many of each colour ball is there in the ball pool?

Together, the total number of balls is 420. 2/7 of the total 420 balls are violet. Therefore the number of violet balls can be calculated by the equation 2/7 x 420/1 = 840/7=120. There are 120 violet balls i...
LW
Answered by Lauren W. • Maths tutor
4434 Views

How does Stevenson use Gothic imagery in Strange Case of Dr Jekyll and Mr Hyde?

The 18th century revival of Gothic medieval architecture brought a renewed focus onto the eeriness of setting in popular literature, providing a tool for writers to use their writings to describe the structu...
WN
Answered by William N. • English tutor
20893 Views

Solve the linear simultaneous equations: 3x + 5y = 45, 2x - 9y = -7

x = 10, y = 3. From the second equation, we have x = (9y - 7)/2. Substituting this expression for x into the first equation gives 3(9y - 7)/2 + 5y = 45. 3(9y - 7) + 10y = 90. 27y - 21 + 10y = 90. 37y = 111. ...
CW
Answered by Cameron W. • Maths tutor
4122 Views