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Finger [1]
2 years ago
12

Set up equations and solve them to find the unknown numbers in the following cases:

Mathematics
1 answer:
noname [10]2 years ago
3 0

Answer:

the answer is 21

Step-by-step explanation:

the number she thinks of is 21 add 21 + 19 to get 40.

divide 40 by 5 to get 8.

You might be interested in
Drag a description to match each equation.
AnnZ [28]

Given:

The descriptions and equations. The equations are

y=4x

y=x+4

To find:

The correct description for each equation and match them.

Solution:

We know that, "+" is used for more and "×" is used for times.

Additive: y is 4 more than x.

y=x+4

Additive: x is 4 more than y.

x=y+4

Multiplicative: y is 4 times x.

y=4x

Multiplicative: x is 4 times y

x=4y

Therefore, the correct description for the equation y=4x is "Multiplicative: y is 4 times x " and the correct description for the equation y=x+4 is "Additive: y is 4 more than x. "

4 0
3 years ago
In a bag, there are 25 marbles. 8 are red and the rest are green. If there are 100 marbles in. a bag, how many are red? *
Sophie [7]

Answer:

32 marbles are red.

Step-by-step explanation:

Think of a quarter, 4 of them equal a dollar.

25 x 4 = 100

So, you will multiply 8 by 4.

8 x 4 = 32

4 0
3 years ago
A dish tv satellite dish is the shape of a paraboloid. the dish is 36 inches wide, and 8 inches deep. how many inches should the
MrRa [10]
Refer to the diagram shown below. It shows a vertical cross-section of the paraboloid through its axis of symmetry.

Let the vertex of the parabola be at the origin. Then its equation is of the form
y = bx²

Because the parabola passes through (18,8), therefore
8 = b(18²)
b = 0.02469
The parabola is y = 0.02469x².

The receiver should be placed at the focal point of the paraboloid for optimal reception.
The y-coordinate of the focus is
a = 1/(4b) = 1/0.098765 = 10.125 in

Answer: The receiver is located at 10.125 inches from the vertex.

4 0
3 years ago
What's the volume? <br><br><br> I honestly just need the formula.
Arturiano [62]

Answer:

v=364.5\ m^3

Step-by-step explanation:

<u>Volume Of A Regular Solid</u>

When a solid has a constant cross-section, the volume can be found by multiplying the area of the base by the height. The area of a trapezium is

\displaystyle A_t=\frac{b_1+b_2}{2}h

where b_1 and b_2 are the lengths of the parallel sides and h the distance between them.

The figure shows a solid with a trapezoid as the constant cross-section and a height x. The volume of the solid is

\displaystyle v=A_t\ x

\displaystyle v=\frac{b_1+b_2}{2}\ h\ x

The image doesn't explicitly say if the length of 4.5 is the height of the trapezium or the length of that side. We'll assume the first, so our data is:

\displaystyle b_1=7m,\ b_2=11m,\ h=4.5m,\ x=9m

We now compute the volume

\displaystyle v=\frac{7+11}{2}.(4.5)(9)=364.5

\boxed{\displaystyle v=364.5\ m^3}

8 0
3 years ago
What is 4/25 as a mixed number
yaroslaw [1]
6 would be the answer
5 0
3 years ago
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