I need help. Can someone pls answer with working thx

Question 1:

The given formula is

To make T, the subject we multiply both sides by 100:

This becomes

Divide both sides by PR

b) Amanda's principal is , P=€2565

The interest rate is 3.5% p.a. that is R=3.5

We want to find how many years, her money will gain an interest of I=€718.20

We substitute into the formula for T,

This simplifies to:

T=8

Therefore it will take 8 years

2) Percentage profit

The cost price of the 80 articles €200

The selling price is 3.5×80=€280

The profit =€280-€200=€80

The percentage profit is now

The percentage profit is 40%

Question 3)

Let the original price of the calculator be x.

Then 85% of this price will be:

This is the same as€32.89

We equate and solve for x.

The original price is €38.69

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct