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Stells [14]
2 years ago
11

100 POINTS + BRAINLYEST Evaluate 7⋅5+42−23÷4 ' 49 41 34 9

Mathematics
2 answers:
Strike441 [17]2 years ago
6 0

Answer:

Step-by-step explanation:

(7*5) + 42 - (23/4)

35 +42 - 5.75

71.25

Could you have meant to write the problem differently

(7*5 + 42 - 23) / 4

54 /4

13.5

Im sorry, but None of those options (with the current way its written is posible, Is the problem written exactly like that? or a way that im missing

--Gage Millar, Algebra 1/2 tutor

alexandr402 [8]2 years ago
3 0

7.5+42−23÷4= 43.75

I hope its help you

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10 POINTS PLEASE HELP!!! IT SEEMS EASY BUT I DONT UNDERSTAND!!!!
Leni [432]
Hello there!

I’m not sure if they want me to add the answers together or just do them separately.

Exponents
(-2)^2=(-2)(-2)=4
(7/6)^2=7/6(7/6)=49/36

I hope this helps!
Best wishes.
-HuronGirl

3 0
3 years ago
Jonas types 560 words in 20 mins. How many words can he type in one hour
dalvyx [7]

Answer:

1680 words.

Step-by-step explanation:

There are 60 minutes in an hour. So all you need to do it 560 + 560 + 560.

I say this because he types 560 word in 20 minutes..20+20+20 is 60 so that means you have to add 560, 3 times as well.


Hope this helped! :)

5 0
3 years ago
In 2000, the number of students enrolled at Arlington Country Day School was 823 students. In 2010, the population was approxima
vivado [14]
705 - 823 = -118

-118/823 = -0.143 = 14.3% decrease
5 0
3 years ago
Read 2 more answers
The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first deter
VMariaS [17]

Answer:

He must survey 123 adults.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the z-score that has a p-value of 1 - \frac{\alpha}{2}.

The margin of error is:

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

Assume that a recent survey suggests that about 87​% of adults have heard of the brand.

This means that \pi = 0.87

90% confidence level

So \alpha = 0.1, z is the value of Z that has a p-value of 1 - \frac{0.1}{2} = 0.95, so Z = 1.645.

How many adults must he survey in order to be 90​% confident that his estimate is within five percentage points of the true population​ percentage?

This is n for which M = 0.05. So

M = z\sqrt{\frac{\pi(1-\pi)}{n}}

0.05 = 1.645\sqrt{\frac{0.87*0.13}{n}}

0.05\sqrt{n} = 1.645\sqrt{0.87*0.13}

\sqrt{n} = \frac{1.645\sqrt{0.87*0.13}}{0.05}

(\sqrt{n})^2 = (\frac{1.645\sqrt{0.87*0.13}}{0.05})^2

n = 122.4

Rounding up:

He must survey 123 adults.

6 0
3 years ago
Solve the inequality.<br> 6+x&gt;56+x&gt;5
weqwewe [10]

Answer:

X>50

X>-51

Step-by-step explanation:

6+x>56

56+x>5

separate the equation into different equations by the sign

I) 6+x>56

x>56-6

x>50

ii) 56+x>5

x>5-56

x>-51

4 0
2 years ago
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