We can set Maggie's age to x
If her brother is six years younger than four times her age, than her brother must be equal to: 4x-6
Since the sum of their ages is 39, we can set up an equation.
(Sum of Maggie's age) + (sum of Maggie's brother's age) = 39
x + (4x -6) = 39
5x -6 = 39
5x = 45
x = 9 , Maggie's age is 9
Answer: The expression for number of faces of a pyramid =1+n
Step-by-step explanation:
A Pyramid is a polyhedron or a three dimensional shape having a polygon base and all lateral faces are triangles .
Its base describe the number of other faces of it.
For example a triangular pyramid has a triangular base which gives rise to 3 lateral faces , and a rectangular pyramid has a rectangular base which give rise to 4 lateral faces and so on.....
So the total number of faces in a pyramid = base + lateral faces
If a pyramid has n sides therefore it give rise to n lateral faces such that
The total number of faces in a pyramid= 1+n .
Answer:
20 helmets were sold ($500)
4 bikes were sold ($2000)
Step-by-step explanation:
Bikes: $500 each, helmets: $25 each
Ratio of helmets to bikes 5:1, or $125:$500, which totals to $625
$2500 ÷ $625 = 4
5:1 x 4 = 20:4
$125:$500 x 4 = $500:$2000
-14, -13, -12.
This is done by calling the first number x, the second x+1 and the third x+2. Then write the equation using the descriptions as...
x + 2(x+1) + 3(x+2) = -76
Distribute and solve.