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Brums [2.3K]
3 years ago
9

20 is what percent greater than 15?

Mathematics
1 answer:
yan [13]3 years ago
8 0

Answer:

18

Step-by-step explanation:

15 + (20% × 15) =

15 + 20% × 15 =

(1 + 20%) × 15 =

(100% + 20%) × 15 =

120% × 15 =

120 ÷ 100 × 15 =

120 × 15 ÷ 100 =

1,800 ÷ 100 =

18

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What is the surface area to volume ratio of a 5 cm cube?
joja [24]
Answer: 6/5

Explanation:
Given: 5cm cube
This means each side is 5 cm because a cube has equal sides.

Area of a square is length times width so area of 1 side of a cube:
= 5 x 5
= 25

Surface area is the area of one side of a cube times the number of sides. Now, how many sides does a cube have? 6
= 25 x 6
= 150

Surface area of a 5cm cube = 150

Volume is length times width times height:
= 5 x 5 x 5
= 125

Ratio of surface area to volume:
= 150/125
= 6/5
6 0
3 years ago
Use algebraic means to show that x^2 + y^2 = 8 is not a function. Explain your process.
11Alexandr11 [23.1K]

Answer:

For a single value of x function has more than one corresponding value of y which satisfies the equation.

Step-by-step explanation:

Function: A relationship between a set of inputs and a set of possible outputs, where exactly one output is associated with each input.

It means for an equation to represent a function any single value of  x there should be only one corresponding value of  y which satisfies the equation.

Now consider the given equation.

x^2 + y^2 = 8

If we put x=0 then we get two value of y i.e \sqrt8 and -\sqrt8 which satisfy the equation  and therefore the equation is not a function.

5 0
4 years ago
What is the directrix of the parabola defined by `(1)/(4)(y + 3) = (x − 2)^2`? A. `y = -(49)/(16)` B. `x = -(49)/(16)` C. `y = (
taurus [48]

The correct answer is y=−1/16

8 0
4 years ago
Read 2 more answers
10=7-m two step equations
poizon [28]

Step-by-step explanation:

10=7-m

10-7=-m

3=-m

m=-3

4 0
3 years ago
Read 2 more answers
Suppose you write and solve an equation to determine the amount of money m you have in your bank account after several weeks.you
harkovskaia [24]
Well suppose you find out that numbers you put in your equation and you solved the equation correctly produces the negative number on your bank account it means nothing except - on your bank account.
3 0
3 years ago
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