9x^4 -225y^8
= 9(x^4 - 25y^8)
= 9(x^2 + 5y^4)(x^2 - 5y^4)
2825/1250 = 2.26
2.26 is the answer i think
Let's write a system of equations. We will use D for Derek's age and S for Sarah's age:
D = 4S
(D - 2) + (S - 2) = 36
We can simplify the second equation:
D + S - 4 = 36
D + S = 40
Now we can use substitution to plug 4S in for D in the second equation:
(4S) + S = 40
5S = 40
S = 8
Sarah is 8 years old.
Answer:
24cm^2
Step-by-step explanation:
1/2Bh is the formula to find a triangle.
Round the 7.8 to an 8 and the 5.78 to a 6. Multiply 8 and 6, getting 48. Divide by 2 because you need 1/2 of the base×height.
48÷2=24
