In three years' time a pet mouse will be as old as his owner was four years ago. Their present ages total 13 years. Find the age of
each now.

owner = 10 years old

mouse = 3 years old

Step-by-step explanation:

Let's say the mouse is currently m years old and the owner is currently o years old.

m + o = 13

In three years, a pet mouse (m+3) will be as old (=) as his owner was 4 years ago (o-4)

m+o=13

m+3=o-4

subtract o from both sides in the first equation to solve for m

m = 13 - o

plug 13-o for m in the second equation to isolate one variable in one equation

13-o+3=o-4

16-o=o-4

add o to both sides to put all the variables on one side

16=2o-4

add 4 to both sides to isolate the variable and its coefficient

20 = 2o

divide both sides by 2 to isolate o

o = 10

m = 13 - o

m = 3

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.

step-by-step explanation:

there is a formula i can give you:

it is r^2*n*sin(360/n) divided by 2 where r represents the "radius" and n is the number of sides.

plug them in:

(10sqrt(3))^2*6*sin(360/6) divided by 2

100*3*6*sin(60) divided by 2

900*sin(60)

900*sqrt(3)/2

450*sqrt(3)

approx is 779.4 cm^2