On a certain sum the interest paid after 3 years is 450 at 5 % rate of interest per annum.
find the sum.

$3000

Step-by-step explanation:

let the inital sum be x

final amount = initial sum + interest = (450 + x)

given that annual interest rate = 5% = 0.05 and time = 3 years

recall that for simple interest

A = P(1 + rt)

where

A = final amount = (450 + x)

P = inital sum = x

r = interest rate = 5% = 0.05

t = time = 3 years

Substituting values into equation

(450 + x) = x [ 1 + (3)(0.05) ]

(450 + x) = x [ 1 + 0.15 ]

(450 + x) = x (1.15)

450 + x = 1.15x

1.15x  - x = 450

0.15x = 450

x = 450/0.15 = $3000

connie < felicia < stew

step-by-step explanation:

stew:

we need to find the slope

m = (y2-y1)/ (x2-x1)

    = (2650-795)/(10-3)

    = 1855/7

265 words per minute

connie:

we need to find the slope

m = (y2-y1)/ (x2-x1)

we have two points (0,0) and (4,800)

m = (800-0)/(4-0)

  m = 800/4

    200 words per minute

felicia:

260 words per minute

200< 260 < 265

connie < felicia < stew

£56

step-by-step explanation: