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4 years ago

14

you answer 95% of the questions correctly on a 40 question test how many questions do you answer incorrectly?

1 answer:

Blizzard [7]4 years ago

5 0

You answer 38 questions incorrectly because you use the part/whole=%/100 so its p/40 = 95%/100 so 40 x 95 = 3800 then divide it by 100 so it is 38 questions.

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How do you write 8/9 as a decimal?

gladu [14]

Answer:

0.888...

Step-by-step explanation:

It depends on how many decimal places you want, or write it as a repeating decimal like I did above. Rounded answers like below would also be correct if you were asked to round it to the nearest tenth, hundredth, thousandth, etc...

0.9

0.89

0.889

0.8889

.

.

.

5 0

3 years ago

Read 2 more answers

2. For the graph, find AB to the nearest tenth<br> y<br> 8<br> А<br> 6<br> B

zheka24 [161]

Answer:

10.8

Step-by-step explanation:

AB can be calculated using the formula $d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}$

The coordinates of A are when x = -2, y = -2

At B, x = 8, y = -6

Let,

$A(-2, -2) = (x_1, y_1)$

$B(8, -6) = (x_2, y_2)$

Plug the values into the formula.

$AB = \sqrt{(8 - (-2))^2 + (-6 -(-2))^2}$

$AB = \sqrt{(8 + 2)^2 + (-6 + 2)^2}$

$AB = \sqrt{(10)^2 + (-4)^2}$

$AB = \sqrt{100 + 16}$

$AB = \sqrt{116} = 10.8$ nearest tenth

7 0

3 years ago

Keith looked at new cars for 40,000 and used ones go for 85% of a new car,how much is a used car

Romashka [77]

A used car is 34,000
You take 40,000 and multiply it by 0.85

6 0

3 years ago

One way to prove this quadrilateral is a square is by calculating the slopes of its sides and the slopes of its diagonals.

tatuchka [14]

Answer:

Step-by-step explanation:

<h3>To prove quadrilateral is a square:</h3>

a) Slope of CB

C(-3,-1) ; B = (0,3)

$\sf \boxed{Slope = \dfrac{y_2-y_1}{x_2-x_1}}$

$\sf = \dfrac{3-[-1]}{0-[-3]}\\\\ =\dfrac{3+1}{0+3}\\\\ = \dfrac{4}{3}$

$\sf \text{\bf slope of CB = $\dfrac{4}{3}$}$

b) D(1,-4) ; A(4,0)

$Slope \ of \ DA = \dfrac{0-[-4]}{4-1}\\$

$= \dfrac{0+4}{3}\\\$

$\sf \text{\bf Slope of DA = $\dfrac{4}{3}$}$

Slope of CB = slope of DA

c) C(-3,-1) ; D(1 , -4)

$\sf Slope \ of \ CD =\dfrac{-4-[-1]}{1-[-3]}$

$\sf = \dfrac{-4+1}{1+3}\\\\ = \dfrac{-3}{4}\\$

$\sf Slope \ of \ CD * Slope of CB = \dfrac{-3}{4}*\dfrac{4}{3}=-1$

So, CD is perpendicular to CB

d) B(0,3) ; D(1,-4)

$Slope \ of \ BD = \dfrac{-4-3}{1-0}\\\\=\dfrac{-7}{1}\\\\=-7$

e) C(-3,-1) ; A(4,0)

$\sf Slope \ of \ CA = \dfrac{0-[-1]}{4-[-3]}\\$

$=\dfrac{0+1}{4+3}\\\\=\dfrac{1}{7}$

$\text{Slope of CA *Slope of BD = $\dfrac{1}{7}$*(-7)}=-1$

So, CA is perpendicular to BD

$\sf \text{\bf Slope of DA = \dfrac{4}{3}}$

5 0

2 years ago

Brainliest to correct quick

musickatia [10]

Answer is <

Why? 1/4 is smaller than 1/2

1/4 can be 4 slices while 1/2 can be 2 slices

2 slices > 4 slices

3 0

3 years ago

Read 2 more answers