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2 years ago

Help!! Please!!!!!!!!!!!!!!

Mathematics

2 answers:

Liono4ka [1.6K]2 years ago

5 0

Answer:

120°

Step-by-step explanation:

All triangles are equal to 180° so you would subtract the total (180) from the given

topjm [15]2 years ago

3 0

The answer is 5, because i used a calculator

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I need to know the slope of the line given the two points

Karo-lina-s [1.5K]

Slope=(y2-y1)/(x2-x1)
=(4-7)/(2--3)
=3/5

7 0

2 years ago

Isabel found 54 coins at the bottom of her backpack. when she looked, she noticed they were only nickels and dimes. Isabel count

goblinko [34]

She had 23 nickles and 31 dimes

Step-by-step explanation:

The given is:

Isabel found 54 coins at the bottom of her backpack
She noticed they were only nickels and dimes
Isabel counted the coins and they totaled $4.25

We need to find how many nickels and dimes she had

Assume that the number of nickels is x and the number of dimes is y

∵ Isabel had 54 coins

∵ The number of nickels is x

∵ The number of dimes is y

∴ x + y = 54 ⇒ (1)

∵ 1 nickle = 5 cents

∵ 1 dime = 10 cents

∵ The coins totaled $4.25

- Change the dollars to cents

∵ 1 dollar = 100 cents

∴ $4.25 = 4.25 × 100 = 425 cents

- Multiply the number of nickles by 5 and the number of dimes

by 10, add the two products and equate the sum by 425

∴ 5x + 10y = 425 ⇒ (2)

Now we have a system of equations to solve it

Multiply equation (1) by -10 to eliminate y

∵ -10x - 10y = -540 ⇒ (3)

- Add equations (2) and (3)

∴ -5x = -155

- Divide both sides by -5

∴ x = 23

Substitute the value of x in equation (1) to find y

∵ 23 + y = 54

- Subtract 23 from both sides

∴ y = 31

She had 23 nickles and 31 dimes

Learn more:

You can learn more about the system of equations in brainly.com/question/6075514

#LearnwithBrainly

6 0

3 years ago

The table shows the cost of posting parcels.

alexandr402 [8]

Jake wants to post a 600 gram parcel and an 800 gram parcel.

He posts them Second Class.

He pays with a £10 note.

How much change should he get?

3 0

2 years ago

N = 9

g100num [7]

Answer:

The p-value is 0.809.

Step-by-step explanation:

In this case we need to perform a significance test for the standard deviation.

The hypothesis is defined as follows:

H₀: σ₀ = 4 vs. Hₐ: σ₀ ≤ 4

The information provided is:

n = 9

s = 3

Compute the Chi-square test statistic as follows:

$\chi^{2}=\frac{(n-1)s^{2}}{\sigma_{0}^{2}}$

$=\frac{(9-1)\cdot (3)^{2}}{(4)^{2}}\\\\=\frac{8\times 9}{16}\\\\=4.5$

The test statistic value is 4.5.

The degrees of freedom is:

df = n - 1

= 9 - 1

= 8

Compute the p-value as follows:

$p-value=P(\chi^{2}_{9}>4.5)=0.809$

*Use a Chi-square table.

Thus, the p-value is 0.809.

7 0

2 years ago

Find a quadratic function in standard form for each set of points

otez555 [7]

For 1 the equation of the parabola is y = x^2 - 8x + 3
For 2 the equation of the parabola is y = -2x^2 - 3x + 1
For 3 the equation of the parabola is y = -x^2 + 5x - 4

5 0

2 years ago