Answer:
70 minutes
Step-by-step explanation:
Mary can type the number of letters in 20 minutes = 6
Maggie can type the number of letters in 20 minutes = 5
Su Ying can type the number of letters in 20 minutes = 2
Working together they can type the number of letters in 20 minutes
= 6 + 5 + 2
= 13 letters
Working together they can type the number of letters in 1 minute = 
To type 45 letters time taken by them = 
= 
= 
= 69.230 ≈ 70 minutes
It will take them 70 minutes to type 45 letters.
Answer:
a) Function A(x) = (60*x - 1/2*x²)
b)Side length x = 60 m the other side y = 30 m
c) A (max) = 1800 m²
Step-by-step explanation:
Area of rectangular garden with length " x " and wide "y"
A = x*y
Perimeter of rectangular area ( only three sides 2*y and 1*x)
P(r) = 2*y + x
P(r) = 120 = 2*y + x
y = ( 120 - x ) /2
Area of the garden as function of x is
A(x) = [( 120 - x ) /2]*x ⇒ A(x) = (60*x - 1/2*x²)
Taking derivatives on both sides of the equation:
A´(x) = 60 - x
A´(x) = 0 60 - x = 0
x = 60 m
Then
y = ( 120 - x ) / 2 ⇒ y = (120 - 60 )/2
y = 30 m
A(max) = 30 * 60
A(max) = 1800 m²
Answer:
2261,9 cm³
Step-by-step explanation:
First, you need to find the area of the base:
A=36
cm²
Now let's multiply it for the height:
36π cm² × 20 cm = 720π cm³
= 2261,9 cm³
Answer:
Step-by-step explanation:
— That's how the notes start, and they only get murkier after that. ... I decide to do my daughter's homework for one typical week. ... So a good day of reading for me, assuming I like the book and I'm not looking for quotable ... Well, imagine if after putting in a full day at the office—and school is pretty much what
Answer:20
Step-by-step explanation: If u need help again: https://mathpapa.com/algebra-calculator.html
