All you need is the double angle identity:
So we have
Apply the identity again to the squared term:
Answer:
hat: $12
t-shirt: $8
Step-by-step explanation:
Let the price of 1 hat = h.
Let the price of 1 t-shirt = t.
Julie: h + 2t = 28
Raj: 2h + t = 32
We have a system of 2 equations in 2 variables.
h + 2t = 28
2h + t = 32
Let's use the substitution method to solve the system of equations.
Solve the first equation for h.
h = 28 - 2t
Substitute 28 - 2t for h in the second equation.
2(28 - 2t) + t = 32
56 - 4t + t = 32
56 - 3t = 32
-3t = -24
t = 8
h = 28 - 2t
h = 28 - 2(6)
h = 12
Answer:
hat: $12
t-shirt: $8
The bottom model shows 20%
Pretty Sure its
1=square root
2=inverse operations
3=cube root
Answer:
124.80
Step-by-step explanation:
price = $104.00
percentage deducted = 20%
price deducted = 104 × 20 ÷ 100
= 20.80
original price = 104.00 + 20.8 = 124.80
