Answer:
y = 0.20m + 10, 100 minutes
Step-by-step explanation:
Equation: y = mx + b
Fill it in.
m = slope = 0.20
b = y-intercept = 10
y = 0.20x + 10 (They wanted the variable to be m. So, changing that.)
y = 0.20m + 10
Fill in.
30 = 0.20m + 10
Solve.
20 = 0.20m
100 = m
She was on the phone for 100 minutes.
First distribute the negative. Then combine like terms. The answer should be 4ab+2a-7
Answer:
The radius of cylinder is 1.05 cm and
The height of cylinder is 2.11 cm
Step-by-step explanation:
Given as :
The total surface area of cylinder = 21 cm
The curved surface area of cylinder =
of the total surface area
I.e The curved surface area of cylinder =
× 21 = 14 cm
∵ The total surface area of cylinder = 2
r h + 2
r²
Where r is the radius and h is the height of cylinder
Or, 2
r h + 2
r² = 21 cm
Or,
= 21 cm ....a
Again ∵ The curved surface area of cylinder = 2
r h
Where r is the radius and h is the height of cylinder
Or, 2
r h = 14 cm . ...b
so . put the value of a into b
I.e 14 cm +
= 21 cm
Or,
= 21 cm - 14 cm
Or,
= 7
so , r² = 
∴ r² = 
I.e r = 
So, radius =
cm
or, r = 1.05 cm
Put the value of r in eq b
2
r h = 14 cm
Or, 2
×
× h = 14 cm
So, h = 
Or, h = 2.11 cm
Hence The radius of cylinder is 1.05 cm and The height of cylinder is 2.11 cm Answer