Answer:
£390
Step-by-step explanation:
The ratio of money in bank:
Terry : Faye
3 : 7
Terry put £220 in his account
Faye withdrew £300 from her account
Unknown:
Initial amount Terry had = ?
Solution:
Let the real amount terry has = 3x
Faye will have = 7x
Now;
3x + 220 = 7x -300
Solving this equation:
3x + 220 = 7x -300
3x - 7x = -300 - 220
-4x = - 520
4x = 520
x = 130
Originally, Terry has 3x = 3 x 130 = £390
Answer:
A. 6x + 4
B. 22 cm
Step-by-step explanation:
The perimeter of the triangle is equal to the sum of all the side lengths, which is (2x+3) + (x+1) + (3x), or 6x + 4.
When x = 3cm, the perimeter is 6(3) + 4, which is 22 cm.
We have been given that Clare made $160 babysitting last summer. She put the money in a savings account that pays 3% interest per year. If Clare doesn't touch the money in her account, she can find the amount she'll have the next year by multiplying her current amount 1.03.
We are asked to write an expression for the amount of money Clare would have after 30 years if she never withdraws money from her account.
We will use exponential growth function to solve our given problem.
An exponential growth function is in form
, where
y = Final value,
a = Initial value,
r = Growth rate in decimal form,
x = Time.
![3\%=\frac{3}{100}=0.03](https://tex.z-dn.net/?f=3%5C%25%3D%5Cfrac%7B3%7D%7B100%7D%3D0.03)
We can see that initial value is $160. Upon substituting our given values in above formula, we will get:
![y=160(1+0.03)^x](https://tex.z-dn.net/?f=y%3D160%281%2B0.03%29%5Ex)
![y=160(1.03)^x](https://tex.z-dn.net/?f=y%3D160%281.03%29%5Ex)
To find amount of money in Clare's account after 30 years, we need to substitute
in our equation.
![y=160(1.03)^{30}](https://tex.z-dn.net/?f=y%3D160%281.03%29%5E%7B30%7D)
Therefore, the expression
represents the amount of money that Clare would have after 30 years.
The answer is D. My dad taught me an easy way to solve those kind of problems.You need to do (60×20)÷100. And since 60 and 20 both have a zero and 100 has 2 zeros, u can cross out all the zeros and just do 6×2 and divide that by 1 and so 20% of 60 is 12. Hope this helped :)
F(n)=235-(235*.3^n)+50n is your equation where * is multiplication and ^ it to the power to.