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In a sale, a bag goes on sale and the price is reduced by 20%. The sale price is £29.40. What is the original price of the bag.

The price of the bag has been reduced by 20% therefore the sale price of the bag is 80% of the full price. If we divide the sale price by 80 to get 1% of the price, we get £29.40/80 = £0.3675. We then mutlip...
AM
Answered by Aleyna M. • Maths tutor
5193 Views

f(x)=3x+c g(x)=cx+8 fg(x)=6x+d Work out c and d.

fg(x) means f of g of x fg(x) = 3(cx+8) + c = 3cx + 24 + c = 6x + d 3cx = 6x 3c=6 c=2 24 + c = d 24+2=d=26
CF
Answered by Ceri F. • Maths tutor
3783 Views

let y=6x^-0.5+2x+1, find dy/dx.

dy/dx = -6(0.5)x^-1.5+2 = -3x^-1.5+2
RL
Answered by Rodger L. • Maths tutor
4272 Views

Can you explain the quadratic formula?

The quadratic formula is used to solve the quadratic equation. Although methods like factorising or completing the square can easily be used, this offers another method which can be used for more difficult e...
SI
Answered by Shazeaa I. • Maths tutor
4569 Views

Show that y=3x-2 and 3y-9x+5=0 are parallel.

Parallel lines have the same gradient (same 'm' value in y=mx+c). Therefore m=3 for both equations; if they are parallel lines. The second equation needs to be rearranged for y to determine this. 3y-9x+5 = 0...
NG
Answered by Nicole G. • Maths tutor
15304 Views