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3 years ago

Please help me on all of them if u can

Mathematics

2 answers:

Vika [28.1K]3 years ago

7 0

Answer:

1) x² + x

2) 2x² - x

3) 4x² + 3x

4) 2x² - 3x

5) 4x - 3x²

6) x + x²

Step-by-step explanation:

Gnoma [55]3 years ago

6 0

Answer:

x2 +1

Step-by-step explanation:

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The length of a rectangle is two less than four times the width. If the perimeter is 26 cm, find the dimensions of the rectangle

gulaghasi [49]

Answer:

w = 3

l = 10

Step-by-step explanation:

l = 4w-2

P = 26cm

P = (l + w) × 2

26 = (4w-2+w) ×2

26 = (4w + w - 2) × 2

26 = ( 5w - 2 ) × 2

26 ÷ 2 = 5w -2

13 = 5w - 2

13 + 2 = 5w

15 = 5w

w = 3

l = 4w - 2

l = (4 × 3) -2

l = 12 - 2

l = 10

7 0

4 years ago

In a deck of cards (no jokers), what is the probability of picking a card with a letter on it?

IgorLugansk [536]

Answer: 4/13

Step-by-step explanation:

How many cards are there total? In a deck of cards without Jokers, you have 52 cards.

Now, what cards have a letter on them? These are the aces, kings, queens, and jacks. There are 16 of these cards in the deck total. Four different types, with four of each type (4 * 4 = 16).

We will put the number of desired outcomes (cards with a letter) over the possible outcomes (total cards) to create our probability.

16/52

4/13

4 0

2 years ago

Which of the following equations represents a proportional relationship?

EleoNora [17]

Answer:

(a)

Step-by-step explanation:

The equation representing a proportional relationship is

y = kx ← k is the constant of proportion

The only equation fitting this description is (a) y = 5x

4 0

3 years ago

To win at LOTTO in a certain state, one must correctly select 6 numbers from a collection of 52 numbers (1 through 52.) The orde

grandymaker [24]

Answer: 14,658,134,400

<u>Step-by-step explanation:</u>

There are 52 numbers to start with. After choosing the first number, there are 51 numbers remaining, etc.

1st and 2nd and 3rd and 4th and 5th and 6th

52 x 51 x 50 x 49 x 48 x 47 = 14,658,134,400

You can also find the answer using the following formula:

$\dfrac{52!}{(52-6)!}=\dfrac{52!}{46!}=\dfrac{52\times 51\times 50\times 49\times 48\times 47 \times 46!}{46!}\\\\\\.\qquad \qquad \qquad \quad = 52\times 51\times 50\times 49\times 48\times 47\\ \\\\.\qquad \qquad \qquad \quad =\large\boxed{14,658,134,400}$

6 0

3 years ago

A researcher would like to investigate whether or not there is a difference in IQ between Psychology and History majors. She gat

Over [174]

Answer:

Paired t test

H0 : μd = 0

H1 : μd > 0

Critical value = 3.499

Test statistic = 2.230

Reject H0 if test statistic > Critical value

Kindly check explanation.

Step-by-step explanation:

Given the data :

110 90 120 98 100 100 90 110

124 100 102 120 110 110 123 120

The hypothesis :

H0 : μd = 0

H1 : μd > 0

Tcritical value, df = n - 1 = 8 - 1 = 7

Tcritical(0.01, 7) = 3.499

The difference, d = (-14,-10,18,-22,-10,-10,-33,-10)

The test statistic :

Xdbar / Sd/√n

The mean difference, Xdbar = Σx / n = - 11.375

The standard deviation of difference, Sd = 14.431

The test statistic :

-11.375 / (14.431/√8) ;

-11.375 / 5.102

= 2.230

Decison :

Reject H0 if test statistic > Critical value

Since ; 2.230 <3.499 ;

We fail to reject the null

7 0

3 years ago