Answer: d=$12, b=$1
d represents DVDs
b represets books
Step-by-step explanation:
Whenever you have 2 examples of 2 different things (such as books and dvds), make a systems of equations.
Step 1: Write a system of equations
3d+4b= 40
d+6b= 18
Step 2: Eliminate any letter. I'll just choose d.
To elimiate d, you have to make them both equal to the biggest d variable. In other words, make both d terms equal to 3d. To do this, miultiply the 2nd equation by 3, and keep the 1st one the same.
3d+4b=40
3d+18b= 54
Now, elimiate d, by doing 3d-3d= 0. Now use subtraction to solve for b since we used this to get 3 and 3 to 0.
4b-18b=40-54
-14b= -14
b= -14÷-14
b= 1
Each book costs 1 dollar.
Step 3: Plug in b=1 to find how much each dvd costs (plug into any equation)
3d+4b=40
3d+4(1)=40
3d+4=40
3d=40-4
3d=36
d=36÷3
d=12
Each dvd is $12
Step 4: Checks--plug d=12 and b=1 into any equation
3d+4b=40
3(12)+4(1)=40
36+4=40
40=40
It's correct ✅
Also i know this was answered really late but id appreciate if i could get brainliest as i worked pretty hard for this :) Hope i could help the best i could :D
2. Gordon can type 1,800 words in 25 minutes.
_________words per minute
What is the height of the larger cone?
Answer:
3
Step-by-step explanation:
Let V and v be volumes of two similar cones.
so R/r=H/h
V=1/3π R²H
v=1/3πr²h
B. (a - b)(a + b)
C. a^2(b-b^2)
D. a^2b^2(b - a)
The factor of the expression into an equivalent form a²b - (ab)² would be; C
Those expressions that might look different but their simplified forms are the same expressions are called equivalent expressions.
To derive equivalent expressions of some expressions, we can either make it look more complex or simple. Usually, we simplify it.
We need to factor the expression into an equivalent form a²b - (ab)²
This expression could also be given by;
a²b - (ab)²
Now, we know that:
a²- b² = (a + b) (a - b)
Now plug the values then we get;
Hence, the factor of the expression into an equivalent form a²b - (ab)² would be; C
Learn more about expression here;
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