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BartSMP [9]
3 years ago
10

A student said that 42% of 78 is 45. Is this answer reasonable

Mathematics
2 answers:
san4es73 [151]3 years ago
7 0

Answer: Sample response: 42% can round to 40%, and 78 can round to 80. 40% of 80 is 32, so 42% of 78 should be about 32. 45 is much greater than 32, so the answer is not reasonable.

Step-by-step explanation:

hjlf3 years ago
6 0
No, the student is wrong. 

42% of 78 is 32.76

Convert the percentage (42) into a decimal by dividing it over 100:
\frac{42}{100} = 0.42

The last step is to multiply the decimal by 78:
0.42 \times 78 = 32.76
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F(x)=−2(x+4)<br><br> What is the value of f(−1)?
Vlada [557]
The value is -6
(-1,-6)
all you have to do it plug in -1 for x
f(-1)= -2(-1+4
f(-1)=-2(3)
f(-1)=-6
7 0
4 years ago
Read 2 more answers
Solve the inequality y^2-3y greater than 18 sorry couldn't find the greater than sign
kupik [55]

Answer:

y > 6 or y < -3

Step-by-step explanation:

y² - 3y > 18

Complete the square.

y² - 3y + 9/4 > 18 + 9/4

y² - 3y + 9/4 > 81/4

(y - 3/2)² > 81/4

y - 3/2 > 9/2, or y - 3/2 < -9/2

y > 6 or y < -3

4 0
4 years ago
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A Web site goes viral. The number of users triples each day. What is the constant percentage increase each day?
aksik [14]

We know that the number of users triple each day

Let number of users on day 1 be x

⇒ Users on day 2 = 3 * (x) = 3x

and Users on day 3 = 3 * (3x) = 9x

And so on...

% Increase in users from day 1 to day 2 = \frac{\text{Users on Day 2 - Users on Day 1}}{\text{Users on Day 1}} * 100

⇒ % Increase in users from day 1 to day 2 = \frac{3x-x}{x} * 100

⇒ % Increase in users from day 1 to day 2 = \frac{2x}{x} * 100

⇒ % Increase in users from day 1 to day 2 = 200%

Similarly,

% Increase in users from day 2 to day 3 = \frac{\text{Users on Day 3 - Users on Day 2}}{\text{Users on Day 2}} * 100

⇒ % Increase in users from day 2 to day 3 = \frac{9x-3x}{3x} * 100

⇒ % Increase in users from day 2 to day 3 = \frac{6x}{3x} * 100

⇒ % Increase in users from day 2 to day 3 = 200%

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3 0
4 years ago
I got the answer wrong, does anyone know what the right answer is?
qaws [65]
It will be x, if y depends on x
Because tent is dependent and the is independent
8 0
3 years ago
I dont get this problem, could you explain it to me? P/3 plus (-7) = 5don't get this problem, could you explain it to me? P/3 ➕
LekaFEV [45]

Answer:

Step-by-step explanation:

Okay so first you have to get rid of the -7

P/3 ➕ (-7) = 5. Add 7 to both sides because that the opposite of subtracting

p/3= 5+7=12

now, multiply by 3 because that is the opposite of dividing

p=12*3= 36

7 0
4 years ago
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