Let us denote the years of Mary with M and the years that Al have with A.
<span>We know that the sum of Mary and Al's age is 48. So, we can write:
M+A=48 (1)
</span><span>We also know that twelve years ago, Mary was twice as old as Al.
So we can write:
M-12=2*A (2)
From the first equation (1): M=48-A
Let put this in the second equation:
48-A-12=2A
36=3A
A=12
M=48-12=36
</span>
Answer:
x = 35 and y = 100
Step-by-step explanation:
Let x = dollar cost per dive and y = dollar cost per night.
ATQ,
4x+3y = 440 .....(1)
and
8x + 5y = 780 .....(2)
Multiply equation (1) by 2.
8x+6y = 880......(3)
Subtract equation (3) from (2).
8x + 5y -(8x+6y)= 780-880
-y = -100
y = 100
Put the value of y in equation (1).
4x+3(100) = 440
4x = 440-300
4x = 140
x = 35
Hence, the value of x is 35 and that of y is 100.
Answer:
Volume= area of cross section*height
so, volume of prism = A*h
The answer is 63.05
Tip-search it up
Final answer = 558
Explanation
Area of rectangle = L x B
Area of triangle = 1/2(b x h)
Area of rectangle = 28 x 21 =588
Area of triangle = 1/2(base x height)
base =(21-16) = 5
height =(28-16) = 12
Area of triangle = 1/2 x 5 x 12 = 30
Area of shaded portion = 588 - 30 =558
Hope it helps
