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3 years ago

Why does nobody answer my questions b.ru.h :(

Mathematics

2 answers:

noname [10]3 years ago

5 0

Answer:

boy

Step-by-step explanation:

s2008m [1.1K]3 years ago

3 0

Answer:

what question do you need help on?

Step-by-step explanation:

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In the set of ordered pairs a function?

MakcuM [25]

Answer:

because each output has exactly one input

3 0

3 years ago

Pls help if you can Thx!

N76 [4]

GIVEN:

Cost of a taco and a cup of tea = $2.10

x + y = 2.10 ...(1)

Cost of 2 tacos and 3 cup of tea = $5.15

2x + 3y = 5.15 ...(2)

ANSWER:

On solving eq(1), we get

x = 2.10 – y

Substitute the value of x in eq(2), we get

2(2.10 – y) + 3y = 5.15
4.20 – 2y + 3y = 5.15
y = 5.15 – 4.20
y = 0.95

So, x = 2.10 – 0.95

x = 1.15

Hence, Cost of a taco is $1.15

So, <u>Correct choice</u> - [E] $1.15

6 0

3 years ago

Read 2 more answers

WILL GIVE BRAINLY PLZ HELP ASAP

Ludmilka [50]

Answer:

the answer is 8 miles

Step-by-step explanation:

8 0

4 years ago

Read 2 more answers

Use compatible numbers to estimate the quotient. Please help.

-BARSIC- [3]

308.3 divided by 15 could be estimated by rounding 308.3 down to 300 and dividing that by 15:

300
----- = 20
15

5 0

3 years ago

A rocket is shot off from a launcher. The accompanying table represents the height of the rocket at given times, where x is time

galben [10]

Answer:

The height at time of 12.1 seconds is approximately 729.2562 feet

Step-by-step explanation:

The general form of the quadratic regression equation is y = A + Bx + Cx²

The quadratic regression formula is given as follows;

$B = \dfrac{S_{xy}S_{x'x'}-S_{x'y}S_{xx'}}{S_{xx}S_{x'x'} -(S_{xx'})^2}$

$C = \dfrac{S_{x'y}S_{xx}-S_{xy}S_{xx'}}{S_{xx}S_{x'x'} -(S_{xx'})^2}$

$A = \bar y - B \bar x - C \bar {x^2}$

$S_{xx} = \Sigma (x_i - \bar x)^2$

$S_{xy} = \Sigma (x_i - \bar x)(y_i - \bar y)$

$S_{xx'} = \Sigma (x_i - \bar x)(x^2_i - \bar {x^2})$

$S_{x'x'} = \Sigma (x^2_i - \bar {x^2})^2$

$S_{x'y} = \Sigma (x^2_i - \bar {x^2})(y_i - \bar {y})$

Solving using an online quadratic regression calculator, gives;

A = 2.5643259

B = 246.6374865

C = -15.41986006

Substituting gives;

y = 2.5643259 + 246.6374865·x -15.41986006·x²

When time, x = 12.1, we have;

y = 2.5643259 + 246.6374865×12.1 -15.41986006×12.1²≈ 729.2562 feet

The height at time of 12.1 seconds ≈ 729.2562 feet.

8 0

3 years ago