Will give brainliest!

Answer:

7x-49=21

Step-by-step explanation:

9514 1404 393

Answer:

  Rs 3200

Step-by-step explanation:

The actual selling price was 20% below the cost price, so was ...

  sp = cp(1 -20%) = 0.80cp

Had the selling price been raised, the selling price would have been 5% above the cost price:

  sp +800 = cp(1 +5%) = 1.05cp

Subtracting the first equation from the second gives ...

  (sp +800) -(sp) = (1.05cp) -(0.80cp)

  800 = 0.25cp . . . . . . . simplify

  3200 = cp . . . . . . . . multiply by 4

The cost price was Rs 3200.

[tex]\frac{9^2}{9^7}=9^{2-7}=9^{-5}=\frac{1}{9^5}[/tex]

Step-by-step explanation:

[tex]8x - 3 = 5 + 4y[/tex]

Isolate y first subtract 5 from both sides

[tex]8x - 8 = 4y[/tex]

Divide both sides by 4.

[tex] \frac{8x - 8}{4} = y[/tex]

[tex]2x - 2 = y[/tex]

y= 1

Step-by-step explanation:

Solve for y:

8x - 3 = 5 + 4y

8x = 4y + 5+3

Divide both sides by 8

x = 1÷2y + 1

plug into equation

8 (1÷2y +1) - 3 = 5 + 4y

Distribute

8÷2+ 8 - 3 = 5 + 4y

4 + 5 -5 = 4y

Combine like item

4 = 4y

divide both sides by 4

y= 1

Answer:

x² - 28x√x + 294x - 1372√x + 2404

Step-by-step explanation:

f(x) = [tex]x^{4}[/tex] + 3

g(x) = x - 7

h(x) = √x

f(g(h(x))) - ?

g(h(x)) = √x - 7

f(g(h(x))) = [tex](\sqrt{x} -7) ^{4}[/tex] + 3 = ( √x - 7 )² × ( √x - 7 )² + 3 =

= (x - 14√x + 49)(x - 14√x + 49) + 3 =

= x² - 14x√x + 49x - 14x√x + 196x - 686√x + 49x - 686√x + 2401 + 3 =

=  x² - 28x√x + 294x - 1372√x + 2404

Step-by-step explanation:

7[3]

3[7]

I don't hv the square root key

plss mark brainliest

Answer:

10.5 yards after 15 years

Step-by-step explanation:

2.1 feet times 15 years, which equals to 31.5 feet, convert 31.5 feet into yards, so divide it by 0.3, and that equals to approximately 10.5 yards

Answer:

He was 16 years old.

Step-by-step explanation:

[tex] = (2021 - 5) - 2000 \\ = 2016 - 2000 \\ = 16[/tex]

Answer:

16 years old.

Step-by-step explanation:

Today's year is 2021

So,

[tex]2000 + 21 = 2021[/tex]

So, whoever's born in 2000, would be 21 years old in 2021. How old was Kollie five years ago?

[tex]21 - 5 = 16[/tex]

Kollie was 16 years old.

Answer:

First train 364, second train 355.3

Step-by-step explanation:

Let's me just say

First train = x

Second train = y

Easier to type like that

So

x + y = 719.3

they say " first train is 8.7 mph faster than that of the second train "

Therefore

x = y + 8.7

Now u have these two equations

x + y = 719.3

x = y + 8.7

Now since u know what is x, just put it in your first equation

x + y = 719.3

y + 8.7 + y= 719.3

2y = 710.6

= 355.3

Therefore the speed of the first train is

x + y = 719.3

x + 355.3 = 719.3

x =364

Answer

Hello

how are you

Answer:

x + 6 = 9

Step-by-step explanation:

6 more means +6. Therefore if 6 more than x is 9, the equation would be

[tex]x + 6 = 9[/tex]

Answer:

6+x=9

Step-by-step explanation:

Step-by-step explanation:

Step-by-step explanation:

Set the equation

[tex](x - 4) {}^{2} [/tex]

swap y and x

[tex](y - 4) {}^{2} = x[/tex]

[tex]y - 4 = {x}^{2} [/tex]

[tex]y = {x}^{2} + 4[/tex]

So the inverse is

[tex] {x}^{2} + 4[/tex]

The domain is [4, infinity)

The range is [0,infinity)

The domain of the inverse is [0, infinity)

The range is [4, infinity)

Answer:

x = -2/ 9

Step-by-step explanation:

[tex] \frac{2}{5}(x - 2) = 4x \\ \frac{5}{2} \times \frac{2}{5}(x - 2) = 4x \times \frac{5}{2} \\ x - 2 = 10x \\ 9x = - 2 \\ x = \frac{ - 2}{9} [/tex]

Answer:

Ans; 10⁴ —> 10, 000

Ans; 10-⁴ / 10² —> 1/ 10⁶ = 0. 000 001

Ans; 10-⁴ × 10² —> 1/ 10² = 0.01

Ans; 10-⁴ —> 1/ 10⁴ = 0. 000 1

I hope I helped you^_^

Answer:

A=a

B=d

C=c

D=b

Step-by-step explanation:

Answer:

I assume you mean 16^(1/3) i.e. the cube root of 16

I am also assuming you mean the real cube root because, as you may know, every non-zero real number has three cube root - one real and two complex conjugates.

Since 16 = 8 x 2 and 8 = 2³ then (2³ x 2)^1/3 = (2³)^1/3 x 2^1/3 = 2 x 2^1/3

You might check that the cube root of 16 is about 2.52 which is twice the cube root of 2

Step-by-step explanation:

Answer:

41

Step-by-step explanation:

9x^2-4x-3 = ? when x=-2

9(-2)^2-4(-2)-3 = ?

9(4)-4(-2)-3 = ?

36+8-3=?

44-3=?

41=?

Answer:

The answer is D. 5 to 2

Step-by-step explanation:

It sounds like they want the ratio to be given in that order.

Hope that helps!

Answer:

13.752km/h

Step-by-step explanation:

Just convert them and devide them

3.82m/s, i can also write it as

3.82m

-----------

1s

Therefore just change the units to your liking

(3.82 ÷1000)km

-----------

( 1 ÷60÷60) hour

Answer:

10.152kmph

Step-by-step explanation:

3.82:1000/1:3600

Answer:

Answer:

42 and 22 are the numbers

Step-by-step explanation:

Let the numbers be x and y

[tex]x + y = 64[/tex]

[tex]x - y = 20[/tex]

On adding both

[tex]x + y + x - y = 64 + 20[/tex]

[tex]2x = 84[/tex]

[tex]x = \dfrac{84}{2} [/tex]

[tex]x = 42[/tex]

Using 1

[tex]42 + y = 64[/tex]

[tex]y = 64 - 42[/tex]

[tex]y = 22[/tex]

Step-by-step explanation:

Fractions are numbers and can be shown on a number line:

Fractions represent equal parts of a whole object or shape:

Whole numbers can be expressed as fractions: For example: 4 = 4⁄1 and 1 = 4⁄4

Answer:

These triangles are simliar because they're all scalene.

Step-by-step explanation:

The triangle ABC is an acute (having angles less than 90 degrees), scalene (no equal sides) triangle.

The triangle BCD is also an acute triangle and scalene.

The triangle ABD is an obtuse (having an angle over 90 degrees), scalene triangle.

Answer:

245

Step-by-step explanation:

multiple the amount of rooms on each floor (35) by the amount of floors (7)

35x7=245 rooms

Answer:

$10.24

Step-by-step explanation:

12(1.30)=12.36

22.60-12.36=10.24