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3 years ago

HELP ME WITH THESE PLEASE I WILL MARK YOU BRAINLIEST IF RIGHT

Mathematics

1 answer:

Ber [7]3 years ago

3 0

The first triangle’s area is 48.75. But since you round it to the nearest tenth, it’s 48.7.

Use the formula a=1/2bh to find the area of a triangle.
A= 1/2• 13 • 7.5
A= 6.5• 7.5
A= 48.75 —-> 48.7 square inches.

Sorry, I can only do one because of homework, but make sure to use that formula! Hope this helped.

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1. Calcula quatre solucions diferents de l'equació x – y = 5 , representa els punts amb ajuda d'uns eixos, i comprova que tots e

Bess [88]

Answer:

Hence 4 different points are as

A(1,-4) ,B(2,-3) ,C(3,-2) D(4,-1)

Step-by-step explanation:

Given:

A line represents as x-y=5

To Find:

4 different points on that line with.

Solution:

Now calculate the points on both axes in order to draw the line .

So Put x=0 then y=-5

And when y= 0, x=5

Two points are (0,-5) and (5,0)

Hence draw line through this point and obtain the other two points by plotting on graph as follows:

(Refer the attachment)

Here the line is 4th quadrant so x will positive and y will negative

And addition of both should result in 5

1) Consider As x=1 then,

y=x-5=1-5=-4

y=-4

Point will be (1,-4)

2)consider As x=2 then

y=x-5=2-5=-3

y=-3

Point will be (2,-3)

3)Consider As x=3 then

y=x-5=3-5= -2

y=-2

Point will be (3,-2)

4) Consider AS x=4 then

y=x-5=4-5=-1

y=-1

Point will be (4,-1)

3 0

3 years ago

Garrett starts his homework at 5:20 he spends 20 minutes or rear and 15 minutes on math at whst time does garrett finish his hom

Whitepunk [10]

The answer is D because 5:20 + 20 + 15 is 5:55

7 0

3 years ago

H (t) = -t2 + t + 12 <br> Solve by using quadratic formula

Sedaia [141]

The quadratic formula is:

$x=\frac{-b+\sqrt{(b)^2-4(a)(c)}}{2a}$

and

$x=\frac{-b-\sqrt{(b)^2-4(a)(c)}}{2a}$

Let's identify our a, b, and c values:

a: -1

b: 1

c: 12

Plug in the values for a, b, and c into the equation. Let's do the first equation:

$x=\frac{-1+\sqrt{(1)^2-4(-1)(12)}}{2(-1)}$

Simplify everything in the radical:

$x=\frac{-1+\sqrt{49}}{-2}$

Simplify the radical:

$x=\frac{-1+7}{-2}$

Combine like terms:

$x=\frac{6}{-2}$

Simplify:

$x=-3$

This is one solution, now, let's solve for the other equation:

Since when simplified, everything is the same except the subtraction sign, we can skip the simplification again and change the sign to subtraction:

$x=\frac{-1-7}{-2}$

Combine like terms:

$x=\frac{-8}{-2}$

Simplify:

$x=4$

Your final answers are:

$x=-3$

$x=4$

8 0

3 years ago

Read 2 more answers

Oliver treated his sister to lunch while visiting her in Cedarburg. Their lunch cost $275, and the sales tax in Cedarburg is 12%

Rudiy27

Answer:

Oliver paid a total of $363.

Step-by-step explanation:

The total amount paid by Oliver on this dinner is given by the cost of their lunch (275) plus the tax (12%) plus the tip (20%). So in order to calculate this value we first need to know how much was paid in tax and the tip, these calculations are shown bellow:

tax = 275*12% = 275*(12/100) = 33

tip = 275*20% = 275*(20/100) = 55

So the total amount paid was:

total = 275 + 33 + 55 = $363

Oliver paid a total of $363.

8 0

4 years ago

Suppose that the lifetime of tv tubes are normally distributed with a standard deviation of 1.1 years. Suppose that exactly 20%

IrinaK [193]

Answer:

4.924 years

Step-by-step explanation:

Lets denote X the lifetime of a tv tube (In years). X has distribution $N(\mu, 1.1)$ , with $\mu$ unknown.

We know that P(X < 4) = 0.2. Using this data, we can find the value of $\mu$ throught standarization.

Lets call $Z = \frac{X - \mu}{1.1}$ the standarization of X. Z has distribution N(0,1), and its cummulative function, $\phi$ is tabulated. The values of $\phi$ can be found in the attached file.

$P(X < 4) = P(\frac{X - \mu}{1.1} < \frac{4 - \mu}{1.1}) = P(Z < \frac{4 - \mu}{1.1}) = \phi(\frac{4 - \mu}{1.1}) = 0.2$

The value q such that $\phi (q) = 0.2$ doesnt appear on the table. We can find it by using the symmetry of the normal density function. The opposite of q, -q must verify that $\phi(-q) = 0.8$ , hence -q must be equal to 0.84. Thus, q = -0.84