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3 years ago

Ten subtracted from a number if the difference is 30 what was the orginal number

Mathematics

1 answer:

nadezda [96]3 years ago

5 0

X-10=30

X=30+10

X= 40

So the original number was 40 and you can prove it by subtracting 10 so 40-10= 30

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The width of a rectang:a is half of its length. If the length is 8 cm, what is

9966 [12]

Answer:24cm

Step-by-step explanation:

if there is 2 sides with the same like the length is 8 and 2 sides(8*2)=16

and the width is half (8/2) =4 double for 2 sides (4*2) = 8

8+16

6 0

3 years ago

in a given year, the rate of flu infection for the general public was 8.3%. And sample of 200 people who receive the flu vaccine

makkiz [27]

Answer:

$\fbox{\begin{minipage}{10em}Option A is correct\end{minipage}}$

Step-by-step explanation:

Step 1: Define significance level

In this hypothesis testing problem, significance levels α is selected: $0.05$ , the associated z-value from Laplace table:

Φ( $z$ ) = α - $0.5 = 0.05 - 0.5 = -0.45$

=> $z$ = $-1.645$

Step 2: Define null hypothesis ( $H_{0}$ ) and alternative hypothesis ( $H_{1}$ )

$H_{0}$ : rate of flu infection $p$ = 8.3% or 8.3/100 = 0.083

$H_{1}$ : rate of flu infection $p$ < 8.3% or 8.3/100 = 0.083

Step 3: Apply the formula to check test statistic:

$K = \frac{f - p}{\sqrt{p(1 - p)} } * \sqrt{n}$

with $f$ is actual sampling percent, $p$ is rate of flu infection of $H_{0}$ , $n$ is number of samples.

The null hypothesis will be rejected if $K < z$

Step 4: Calculate the value of K and compare with $z$

$K = \frac{(\frac{3.5}{100}) - 0.083}{\sqrt{0.083(1 - 0.083)} } * \sqrt{200} = -2.46$

We have $-2.46 < -1.645$

=>This is good evidence to reject null hypothesis.

=> The actual rate is lower. (As $H_{1}$ states)

Hope this helps!

5 0

3 years ago

Sally has £520

PIT_PIT [208]

Answer:

£132

Step-by-step explanation:

15% of 520 is 78

15% of 360 is 54

78 + 54 = 132

6 0

3 years ago

!!25 POINTS AND BRAINLIEST!! A recipe calls for 2 cups of pizza sauce. I only want 3/4 OF the full 2 cups. How will I figure out

Nutka1998 [239]

Mathematical Answer: 2cups*3/4 = 1 and 1/2 cups or 1.5 cups.

How to do it while cooking:

Get out a container large enough to hold at least 4 cups sauce
Get out a "1 cup" and "1/2 cup" measuring cup.
Measure out 1 cup of sauce with the "1 cup" measuring cup.
Measure out 1/2 of a cup of sauce with the '1/2 cup' measuring cup.
pour both cups into the larger container.

And there you go you have 3/4 of 2 cups of sauce.

Hoped this helped!

5 0

3 years ago

Read 2 more answers

I need help please I’m confused

Ahat [919]

Answer:

The answer is 50 degrees

Step-by-step explanation:

The small box at the corner of the triangle indicates that the triangle is exactly 90 degrees, or a right angle. In order to solve the expression, you would need to do 40 + x = 90, which would be x = 50

8 0

3 years ago

Read 2 more answers

Ten subtracted from a number if the difference is 30 what was the orginal number​

Ten subtracted from a number if the difference is 30 what was the orginal number