Solve each system using substitution. Check your answer
x+3=y
3x+4y=7

Answer:

Every 10 seconds

Step-by-step explanation:

The bob crosses its midline whenever cos(2π(t-2)/20)=0.

Since cosθ=0 when θ=±π/2 + 2πn, we can find then the bob crosses its midline by solving:

2π(t-2)/20 = ±π/2 + 2πn

t-2 = ±5+20n

The solutions are when t = -3, 7, 17, 27, 37, ...

Therefore, the bob passes its midline every 10 seconds.

Answer:

33.6 cm

Step-by-step explanation:

120 x 0.72 = 86.4

120 - 86.4 = 33.6

The new rectangle which is 72% shorter is 21.6 centimeters.

A percentage is a value per hundredth. Percentages can be converted into decimals and fractions by dividing the percentage value by a hundred.

Given The original rectangle is 120 centimeters.

And the new rectangle is 72% shorter or (100 - 72)% = 18% of the original rectangle which is,

= (18/100)×120 centimeters.

= 21.6 centimeters.

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Answer:

average rate of change of h(x) on −1 ≤ x ≤ 5 is then 5

Step-by-step explanation:

                                            change in h(x)

average rate of change = ------------------------

                                            change in x

Calculate h(x) at the interval endpoints:  -1 ≤ x ≤ 5, and then subtract h(5) from h(-1):

h(5) = (5)² + 5 + 4 = 34

h(-1) = (-1)² -1 + 4 = 4

change in h(x) = 34 - 4 = 30

change in x:  5 - (-1) = 6                                                 30

average rate of change of h(x) on −1≤x≤5 is then  ------------- = 5

                                                                                         6

Answer:

1

Step-by-step explanation:

Answer:

The teacher disliked her average student because he was like all the other students???

Complete question :

Scottie is standing next to a lighthouse on the edge of a cliff overlooking the ocean. The cliff is 30 meters above sea level, and the lighthouse has a height of 15 meters. There is a man fishing in a boat directly below Scottie who has hooked a fish that is 10 meters below the surface of the water.

​

​a. Use positive and negative numbers to represent the locations in relation to sea level.

​Scottie =

​Top of the lighthouse =

​The boat =

​The fish =

​b. How far is Scottie from the fish?

meters.

Answer:

Scottie = +30 m

Lighthouse = +45m

Boat = 0

Fish = - 10m

40 m

Step-by-step explanation:

Scottie = 30m ( height of the cliff) since he is standing on it's edge

Top of lighthouse = since, lighthouse is located on top of the cliff ; height of cliff + height of light house = (30 + 15) = 45m

The boat = 0 (on the surface of water) ; this is the sea level surface or point

The fish = - 10 m (10 meters below the water surface).

Distance between scottie and fish :

30 m - ( - 10m)

30m + 10m

= 40 m

Answer:

x = 6

Step-by-step explanation:

sin 30° = 3/x

0.5 = 3/x

.5x = 3

x = 3/.5

x = 6

The indicated side of the right-angled triangle is 6.

A triangle is said to be right-angled if one of its inner angles is 90 degrees, or if any one of its angles is a right angle.

Given:

The triangle is a right-angled triangle.

So, we know,

SinФ = perpendicular / hypotenuse.

And here, perpendicular = 3 unit

And hypotenuse = x unit

Substituting the values,

Sin30° = 3/x

1/2 = 3/x

x = 6

Therefore, the value of x is 6.

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Answer:

18/720 =2.5% that is the answer

Answer:

2.5%

Step-by-step explanation:

To find what percent a part is of the whole, divide the part by the whole and multiply by 100%.

18/720 * 100% = 2.5%

Answer: 10

Step-by-step explanation:

Answer:

(-8, 10)

Step-by-step explanation:

A P E X

Answer:

why does math even exist

Step-by-step explanation:

Step-by-step explanation:

(9x2 - 2x +7) +(4x2+7x +2)

9x2 - 2x +7 +4x2 +7x +2

13x2 +5x +9

Answer:

A.  13x2 + 5x + 9

Step-by-step explanation:

use math-way it helps with problems like this

The equivalent expression for the given expression 36x + 24 is 2 (18x + 12). Option D

Algebraic expressions are defined as expressions made of mathematical operation like;

These expressions also consist of terms, coefficients, variables, factors and constants.

Factorization can be defined as a mathematical method of writing a number or mathematical element as a product of several other factors.

Note also that equivalent expressions have the s

Given the expression;

36x + 24

Factorize common term, we have

2(18x + 12)

Thus, the equivalent expression is 2(18x + 12)

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Step-by-step explanation:

122+v=180

v=180-122

v=58

w+61=180

w=180-61

w=119

61+58+y=180

119+y=180

y=180-119

y=61

61+x=180

x=180-61

x=119

j=180

Answer:

17.88

Step-by-step explanation:

18- 12/ 100=

447/24=

then simplify

Answer:

20.16

Step-by-step explanation:- 12% × 18 =

- 12 ÷ 100 × 18 =

- 12 × 18 ÷ 100 =

- 216 ÷ 100 =

- 2.16

Answer:

18

Step-by-step explanation:

Answer:

Peter has 6 dollars.

Step-by-step explanation:

The ratio is 1:3, meaning Jane has 3x more money than Peter. Or, Peter has 1/3 as much money as Jane. You know that Jane has 12 dollars more than Peter so you can think of scenarios. Because it is a 1/3 the answer for Peters money has to be 1/3 of Janes, so Peter has 6 dollars, and Jane has 12 more, so Jane has 18 dollars.

Answer:

Step-by-step explanation:

The distance from the centre to any point on the circle is called the 'radius'. ... (i) Find the centre and radius of the circle (x-2)2+(y + 5)2 =9. ... Find the equation of the circle which has the line segment from a(-4, 3) to b(2, 1) as diameter. ... b and c. 22. Find the equation of the circle with centre (1, 3) and having the line 3x + 4y ...

Answer:

x = 9

Step-by-step explanation:

12^2+x^2 = 15^2

==> x = 9

Answer:

9

Step-by-step explanation:

x = [tex]\sqrt{c^{2} - a^{2} }[/tex]

x = [tex]\sqrt{15^{2} - 12^{2} }[/tex]

x = [tex]\sqrt{225 - 144}[/tex]

x = [tex]\sqrt{81}[/tex]

x = 9

Let me break this up.

Note: (f o g)(2) = f(g(2)).

Note: g(2) = (2, 2) means when x is 2 y is 2.

In other words, g(2) is 2.

We know that f(g(2)) = f(2).

You can see that f(2) = -3. This is given in the point (2, -3).

So, f(g(2)) = -3.

Done.

Answer:

(bd×ac)÷2

108÷2

54cm^2

Step-by-step explanation:

hope u like the ans

Answer:

54cm

Step-by-step explanation:

AC = 9cm

BD = 12 cm

Area of rhombus = 1/2 × AC × BD

= 1/2× 9×12

= 9× 6

= 54 cm

Answer:

B or 2

Step-by-step explanation:

Because 2 and 4 are alternative interior angles that means that they are equal, but on the inside of the traversal (Parallels AB and CD)

Hope this helped :)

Answer:

it should be angle 2 and 4

Step-by-step explanation:

since 2 and 4 are interior angles they are the same and congruent so they have to be equal for the line to be parallel

Answer:

y = 1%

Step-by-step explanation:

From the formula;

Interest; i = PRT/100

P = £5000

R = 10%

After 1 year, we have;

i = 5000 × 10 × 1/100 = £500

Amount is now; 5000 + 500 = £5500

Since interest rate is now y% every year after the first one, then;

After 2nd year;

i = (5500 × y × 1)/100

i = 55y

So amount is now;

5500 + 55y

After 3rd year, interest is now;

i = (5500 + 55y) × y × 1/100

i = 55 + 0.55y²

Amount is now;

(5500 + 55y) + (55 + 0.55y²)

Since she has £5610.55 after 3 years, then;

(5500 + 55y) + (55 + 0.55y²) = 5610.55

0.55y² + 55y + 5555 - 5610.55 = 0

0.55y² + 55y - 55.55 = 0

From quadratic formula, y = 1%

Answer: The answer is B.

Step-by-step explanation: This is because the x-axis is days, and the y-axis is pounds. The option B states that Winnie eats 5 pounds of dog food in 2 days, while actually the dog eats 2 pounds of dog food in 5 days.

Answer:

Its B!

Step-by-step explanation:

The X axis represents days and the Y axis represents pounds! 5 is the X axis and 2 is the Y axis! So to make the sentence true, it would be (2,5).

Hope this helps, and don't forget to follow!

Answer:

-11x -19 = -41

We need to add 19 to both sides then divide to find x.

_____________________

1)) so -11x -19 + 19 = -41 + 19

2)) -11x = -22

3)) -11x/-11 = -22/-11

x = 2

GL!

(side note, i dont usually ask, but it would be great if you could mark me brainliest so I can level up <33)

Answer:

x = 2

Step-by-step explanation:

-11x - 19 = -41

Add 19 to both sides of the equation:

-11x - 19 + 19 = -41 + 19

-11x = -22

Divide both sides by -11

-11x/-11 = -22/-11

x = 2

Answer:

the orange one

Step-by-step explanation:

the bottom angles are gonna be the same and a triangle is 180 degrees total so

Answer:

The answer will be C x=14 and y=7

Step-by-step explanation:

Hope this HElped

Answer:

114

Step-by-step explanation:

If this answer helped you then please mark it as brainliest so I can get to the next rank

Answer:

Here it is:

:P

Answer:

s=15/7 - 5r/7

Step-by-step explanation: