Question 932897
1) Perimeter(P) of rectangle = 2l + 2w where l is length and w is width
l = w+2
20 = 2(w+2) + 2w
20 = 2w +4 + 2w
4w = 16
w = 4 inches
l = 6 inches
2) let x be first side
P of triangle is the sum of its three sides
40 = x + x+7 + x+9
40 = 3x + 16
3x = 24
x = 8
first side is 8 cm
second side is 15 cm
third side is 17 cm
3) d + p = 17 where d is number of dimes, p is number of pennies
.10d + .01p = 1.16
solve first equation for p
p = 17 - d
now substitute for p in second equation
.10d + .01*( 17 - d) = 1.16
.10d + .17 - .01d = 1.16
.09d = .99
d = 11
p = 6
there are 11 dimes and 6 pennies