Sally had some marbles. After buying 12 more marbles, she had 25 marbles. Write and solve an equation to show how many marbles Sally had before she bought more.

Answer:

√384 esa es la respuesta ayudame a mi porfa

Answer:

Surface area = (Perimeter of the base × Length of the prism) + (2 × Base Area) = (S1 + S2+ S3)L + bh;

Answer:

28687.5

Step-by-step explanation:

Un gramo equivale a $38,25, por lo que si tenemos 750 de esos gramos, tendríamos que multiplicarlos para obtener el costo total.

Answer:
NK = 14.4

Step-by-step explanation:

Given the following question:

We know that the two sides are similar
JI = 3, NM = 7.2

The scale factor is 2.4 since....

[tex]3\times2.4=7.2[/tex]

Knowing the two sides are similar and if we multiply JI by 2.4, we get NM we can easily do the same for JG and NK.

JG = 6
[tex]6\times2.4=14.4[/tex]
[tex]=14.4[/tex]

NK = 14.4

Hope this helps.

Answer:

3

Step-by-step explanation:

1(8)+2(16)+3(24)+4(32) ÷ 8+16+24+32

8+32+72+128÷ 8+16+24+32 = 240÷80 = 3

Answer:

-7

Step-by-step explanation:

∠D = ∠B

2x² + 7 = x² - 8x

2x² - x² + 8x + 7 = 0

x² + 8x + 7 = 0

(x + 7)(x + 1) = 0

x = -7 or -1

For x = -7, we have

x² - 8x = 49 + 56 = 105

2x² + 7 = 2*49 + 7 = 105     Right, x = -7 is an answer

For x = -1, we have

x² - 8x = 1 + 8 = 9 < 90

In the diagram angle B is > 90, so x = -1 is not the answer.

Answer : 4 Degrees Celsis​

Explanation : Use The Absolute Value

I  -4  I = 4

◊ YusuCr ◊

Answer: 4 degrees Celsius

Hope this helps!

Answer: -1 is a rational number.

Step-by-step explanation: -1 is a rational number because it is an integer. An integer can be any number, such as -5, 5, 0, 3, etc.

Rational numbers can also be perfect squares (i.e square root of 25), it can be repeating decimals or decimals in general.

Irrational numbers are numbers that cannot be written as a fraction OR that are imaginary.

Irrational numbers would be repeating decimals that do not have the same values repeated, such as Pi. Pi cannot be written as a fraction, only estimated. Irrational numbers can also be imaginary numbers such as the square root of -4. There is no number in this world that can multiply itself and become -4. A negative times a negative is positive, and a positive times a positive is a positive. This means the square root -4 is imaginary and therefore irrational.

Answer:

Yes.

Step-by-step explanation:

All integers, fractions, whole numbers & natural numbers fall into the category of rational numbers.

How are integers rational numbers?

The definition of rational numbers says that any number that can be written in the form of p/q, where p & q are integers & q is not equal to 0 are categorised into rational numbers. This is in the form of the fraction. We know that, by dividing the integers by 1, we'll get them as a fraction. Sp, integers are rational numbers.

For example:

- 1 = -1/1 (p/q form; so it's a rational number)

________

Hope it helps ⚜

Solution:

It should be noted:

We can tell that:

This clearly tells us that the inequality is x > -1

In conclusion:

Option C is correct.

Answer: B

Step-by-step explanation:

Answer:

20 miles per gallon

Step-by-step explanation:

We want a unit rate where

1 is in the denominator

so we divide top and bottom by 20

[tex]\frac{400 miles/20}{20 gallons/20}[/tex]  = [tex]\frac{20 miles}{1 gallon}[/tex] = 20 miles a gallon

Step-by-step explanation:

Thr solution to a system of equations when graphing is the point of intersection of teh lines

Answer:

(9/40)

Step-by-step explanation:

Sin is Opposite/Adjacent

sin(C) = AB/BC

We can find the value of AB by using the Pythagorean Theorem:

a^2 + b^2 = c^2

(80)^2 + b^2 = (82)^2

b = 18

sin(C) = 18/80 or (9/40)

Answer:

22

Step-by-step explanation:

We are given the expression:—

[tex]\displaystyle \large{5n-3}[/tex]

When n = 5, substitute/change n to 5:—

[tex]\displaystyle \large{5(5)-3}[/tex]

Evaluate:—

[tex]\displaystyle \large{25-3=\boxed{22}}[/tex]

__________________________________________________________

Summary

  Substitution

Changing or replacing from a term to another terms/expression is called substitution.

Examples:—

If we are given the expression [tex]\displaystyle \large{2y-1}[/tex] and we want to find the value when y = 4, simply replace y-term to 4.

[tex]\displaystyle \large{2(4)-1=8-1=\boxed{7}}[/tex]

__________________________________________________________

If you have any doubts regarding my answer/explanation, do not hesitate to ask in comment!

Solution:

Note that:

Finding the area of the square.

Finding the area of the 2 triangles.

Since there are two triangles with the same base and height, we will multiply the area by 2 to cover the other triangle.

Finding the area of the trapezoid.

Answer:

Its A

Step-by-step explanation:

Answer:

The sentence is passive.

(Btw this is English lol, not mathematics)

adding 2 on both sides....maybe

Answer:

300 rxc icz ugv ddhhbs hhjo

The radius of the given circle is 12.1 (correct to the nearest tenth), computed using chord properties.

We assume the radius of this circle to be x.

By the theorem saying that a perpendicular from the center of the circle to a chord, bisects the chord, we can say that CE = ED = 0.5CD = 0.5*18 = 9.

Now, we know that NC = NA = radius of the circle = x.

We are given that AE = 4.

Therefore, NE = NA - AE = x - 4.

Now, in right-angled triangle NEC, by Pythagoras theorem, we can say that,

NC² = CE² + NE²

or, x² = 9² + (x - 4)²

or, x² = 81 + x² - 8x + 16

or, x² - x² + 8x = 97

or, 8x = 97

or, x = 97/8 = 12.125 ≈ 12.1 (correct to the nearest tenth, that is, rounding off up to one decimal place).

Learn more about chord properties at

https://brainly.com/question/13950364

#SPJ10

Answer:

b/c+30

Step-by-step explanation:

Answer:

y=x-40

Step-by-step explanation:

Answer:

D. Knowing that 5^2 + 9^2 < 12^2, draw the 5 cm side and the 9 cm side

with a right angle between them. The 12 cm side will fit to form a

right triangle

Step-by-step explanation: mark me brainliest!!

Hypotenuse = h

Altitude = lBase = bl²+b²=h²

Here 6²=369²=8112²=14415²=225

From the above it is clear that81+144=225⇒9²+12²=15²

Answer:

Step-by-step explanation:

Answer:

a for the fist c  for 2 d for 3 and idontknow

4

Step-by-step explanation:

===================================================

Explanations:

Problem 1

v = 9i - 4j means we move 9 units to the right and 4 units down.

Another way to write this is v = <9, -4>

----------------------

Problem 2

R = (-19, 6)

S = (-35, 13)

Subtract x coordinates:  xS - xR = -35 - (-19) = -16

Subtract y coordinates: yS - yR = 13 - 6 = 7

Those results form the vector v = -16i + 7j

This vector indicates we move 16 units left and 7 units up when going from point R(-19,6) to point S(-35,13).

----------------------

Problem 3

t = -5i + 12j

||t|| = sqrt( (-5)^2 + (12)^2 )

||t|| = 13

theta = arctan(12/(-5))

theta = -67.38

Add on 180 to get to the proper quadrant Q2

-67.38 + 180 = 112.62

Therefore,

[tex]t = 13\bigg\langle \cos(112.62^{\circ}), \ \sin(112.62^{\circ})\bigg\rangle[/tex]

----------------------

Problem 4

The x, y components are the coefficients of the linear form.

This allows us to go immediately from <-39,16> to -39i + 16j

----------------------

Problem 5

P = (-5,11)

Q = (-16,4)

Subtract x coords: xQ - xP = -16 - (-5) = -11

Subtract y coords: yQ - yP = 4 - 11 = -7

The component form of vector t is <-11, -7> and this vector is in Q3.

r = sqrt(a^2 + b^2)

r = sqrt( (-11)^2 + (-7)^2 )

r = 13.038 is the approximate length of the vector.

theta = arctan(b/a)

theta = arctan(-7/(-11))

theta = 32.471

Add on 180 so we get to Q3

32.471+180 = 212.471

Therefore, we have

[tex]x = r\cos(\theta) = 13.038\cos(212.471^{\circ})\\\\y = r\sin(\theta) = 13.038\sin(212.471^{\circ})\\\\t = xi + yj\\\\t = 13.038\cos(212.471^{\circ})*i + 13.038\sin(212.471^{\circ})*j\\\\[/tex]

in which you could write into this slightly more compact form

[tex]t = 13.038\bigg\langle\cos(212.471^{\circ}),\sin(212.471^{\circ})\bigg\rangle\\\\[/tex]

For more info, check out polar to cartesian conversion formulas.

Answer:

The answer would be 20 because 2x2=4 right so 10x2=20

Step-by-step explanation:

Answer:

80 cm

Step-by-step explanation:

perimeter = Side × 4 = 20 × 4 = 80 cm

I hope you understand...

Answer:

[tex]Please\ see\ attached\ photo[/tex]

Step-by-step explanation:

[tex]1.Plane\ is\ usually\ painted\ as\ a\ parallelogram,\ and\ the\ plane\ has\ infinite\ ductility.[/tex]

[tex]2.\ A\ line\ has\ no\ endpoints\ at\ both\ ends\ and\ can\ extend\ infinitely\ to\ both\ ends.[/tex]

[tex]3.\ Points\ are\ usually\ represented\ by\ dots[/tex]

[tex]4.\ Same\ as\ 3[/tex]

[tex]5.\ Same\ as\ 2[/tex]

I hope this helps you

:)

By comparing the figure with simpler shapes (rectangles and triangles) we will see that its area is 30ft^2.

The area of the figure will be equal to the difference between the area of a 5ft by 10 ft rectangle, and the area of the 3 triangles that can be formed.

The area of a 5ft by 10ft rectangle is:

A = 5ft*10ft = 50ft^2

For the 3 triangles we have:

2 triangles with a base of 5ft - 3ft = 2ft, and a height of 10ft/2 = 5ft.

(these are the two left triangles).

Remember that for a triangle of base b and height h, the area:

A = b*h/2

Then for each of these triangles, the area is:

A' = (2ft*5ft)/2 = 5ft^2

And we have two of these, so the areas add up to 10ft^2.

For the right triangle, we can see that its base measures 10 ft, and its height is of 2 ft, then its area is:

A'' = (10ft*2ft)/2 = 10ft^2

Then the area of the figure is:

Area = A - 2A' - A'' = 50ft^2 - 2*(5ft^2) - 10ft^2 = 30ft^2

If you want to learn more about areas, you can read:

https://brainly.com/question/24487155