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IRISSAK [1]
3 years ago
11

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:

<em>Step 1: Define significance level</em>

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

<em>Step 2: Define null hypothesis (</em>H_{0}<em>) and alternative hypothesis (</em>H_{1}<em>)</em>

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

<em>Step 3: Apply the formula to check test statistic:</em>

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

<em>Step 4: Calculate the value of K and compare with </em>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:

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

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

<em>Hoped this helped!</em>

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
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