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3 years ago

Need helpp fastt plss will give brainliest to who is correct plss helpp

Mathematics

2 answers:

Mandarinka [93]3 years ago

6 0

1-7
3-21
5-35
7-49

Hope this helps!

tiny-mole [99]3 years ago

5 0

Answer:

Row 1 = 7

Row 2 = 21

Row 3 = 35

Row 4 = 49

Step-by-step explanation:

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#72 i will give brainliest to the best answer!

Zarrin [17]

Step-by-step explanation:

Select all of the following that are quadratic equations.

x² + 3x - 5 = 0 ✓

x² - x = 3x + 7 ✓

5x - 7 = 0 X

7x² + 14x = 0 ✓

x³ - 3x² + 1 = 0 X

x - 5 = 9x + 7 X

What is quadratic equations?

Quadratic equations is a equation that has a general form like "ax² + bx = c"

For example :

x² + 3x - 5 = 0

x² + 3x = 5

x² → ax²

3x → bx

5 → c

4 0

2 years ago

Given sin

Effectus [21]

Answer: $\frac{11}{12}$

Step-by-step explanation:

Use trigonometry (shown in image below) to find the 3 side-lengths:

The side opposite of θ = $\sqrt{23}$
The base side adjacent to θ = 11
The hypotenuse = 12

According to right triangle trigonometry:

cos θ = $\frac{adjacent}{hypotenuse}$

Substitute in the values:

cos θ = $\frac{11}{12}$

5 0

3 years ago

On a two week job a repairman works a total of 70 hours. He charges 75$ plus 40$ per hour. An equation shows this relationship w

Viefleur [7K]

Answer:

Slope = 40

Step-by-step explanation:

Time spent = 70 hours(given)

Fixed charge = $75 (given)

x = Total number of hours (given)

Variable charge = $40 * Total number of hours.

Variable charge = $40x

Fee charged, y = Variable charge + Fixed charge

y = 40x + 75 ($)

The equation of a straight line is given as: y = mx + c

where m = slope

Comparing it with the equation above, m = 40

4 0

3 years ago

Consider two boxes, one containing one black and one white marble, the other, two black and one white marble. A box is selected

valina [46]

Answer:

$\frac{7}{12}$

Step-by-step explanation:

Probability refers to chance of happening of some event.

Conditional probability is the probability of an event A, given that another event B has already occurred.

$B_1,B_2$ denote the two boxes.

In box $B_1$ :

No. of black balls = 1

No. of white balls = 1

In box $B_2$ :

No. of black balls = 2

No. of white balls = 1

Let B, W denote black and white marble.

So, probability that either of the boxes $B_1,B_2$ is chosen is $\frac{1}{2}$

Probability that a black ball is chosen from box $B_1$ = $\frac{1}{2}$

Probability that a black ball is chosen from box $B_2=\frac{2}{3}$

To find:probability that the marble is black

Solution:

Probability that the marble is black = $\frac{1}{2}(\frac{1}{2} )+\frac{1}{2}(\frac{2}{3})=\frac{1}{4}+\frac{1}{3}=\frac{7}{12}$

6 0

3 years ago

So do i divide by 2 each time?

Dmitrij [34]

Divide by two if you are dividing by two...

8 0

3 years ago