She invested "a" at 4% and "b" at 7%
now, how much is 4% of a? well 4/100 * a or 0.04a
how much is 7% of b? well 7/100 * b, or 0.07b
now, we know their interest yield was 480, thus
0.04a + 0.07b = 480
we also know, she had 8000 to invest and split it in two investments, so
a + b = 8000
now
![\bf \begin{cases} a+b=8000\implies \boxed{b}=8000-a\\ 0.04a+0.07b=480\\ ----------\\ 0.04a+0.07\left( \boxed{8000-a} \right)=480 \end{cases}](https://tex.z-dn.net/?f=%5Cbf%20%5Cbegin%7Bcases%7D%0Aa%2Bb%3D8000%5Cimplies%20%5Cboxed%7Bb%7D%3D8000-a%5C%5C%0A0.04a%2B0.07b%3D480%5C%5C%0A----------%5C%5C%0A0.04a%2B0.07%5Cleft%28%20%5Cboxed%7B8000-a%7D%20%5Cright%29%3D480%0A%5Cend%7Bcases%7D)
solve for "a" to see how much she invested at 4%
what about "b"? well b = 8000 - a
Answer:
6 songs
Step-by-step explanation:
It's best to start by setting up an equation equal to $20.
$14 + $.99s = $20
s being songs in this case.
First we add like terms by subtracting $14 from both sides.
$.99s = $6
Now we solve for s by dividing both sides by $.99
s = $6.06
Therefore, Josh can by 6 songs.
Answer:
idk
Step-by-step explanation:
Step-by-step explanation:
The given shape is a cube.
SURFACE AREA
= 6(a²)
= 6(5²)
= 6(25)
= 150cm²