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3 years ago

Eight less than four times a number

Mathematics

2 answers:

kolbaska11 [484]3 years ago

5 0

X - the number

<span>Eight less than four times a number </span>

4 · x - 8 = 4x - 8

ValentinkaMS [17]3 years ago

4 0

U'm maybe 12, and you multiply any number by 4 because 8-4=4 and 4 times your number is the number you chose
.

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How many natural numbers N have the property among 1,2,..........,N exactly 30% are divisible by 3?

k0ka [10]

Answer:

The answer is B. 2.

Step-by-step explanation:

We know that for N = 1 and N = 2, none of them are divisible by 3.

For N = 3, 33.33% are divisible by 3. For N = 4, 25% (which is already less than 30%), so N = 5 would also be less.

At N = 6, we're back up to 33.33%. N = 7 is already less than 30%.

At N = 9, you guessed it, 33.33%. N = 10 is 30% (3, 6, and 9). So we have one case.

Moving along, at N = 18, 33.33%. N = 20 is again 30% (3, 6, 9, 12, 15, and 18). Two cases now.

Finally, at N = 21, again 33.33%. N = 22 and N = 23 are both greater than 30%. As we continue this, for any N after 20, we will always be greater than 30%.

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3 years ago

6 more than a number w is 2

never [62]

Given a number w, six more than that number is $w+6$ . If you want this result to be 2, you have

$w+6=2$

Subtract 6 from both sides to get

$w = 2-6=-4$

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3 years ago

Simplify the exponent 6^-3

damaskus [11]

1/216 is the simplest, but <span>0.00462962962 is more precise.</span>

5 0

3 years ago

Read 2 more answers

I need some help with this calculus question

Over [174]

The tangent to $y$ at the point (0, 5) has a slope equal to the derivative evaluated at $x=0$ .

$y=x^4+5e^x\implies y'=4x^3+5e^x\implies y'(0)=5$

This tangent passes through the point (0, 5), so its equation is

$y-5=5(x-0)\implies y=5x+5$

The normal line passes through the same point, but is perpendicular to the tangent line, so its slope is the negative reciprocal of the slope of the tangent. So the equation for the normal line is

$y-5=-\dfrac15(x-0)\implies y=5-\dfrac x5$

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3 years ago

A class has 18 students. the teacher asks how many students in the class have pets and find 5/9 of students have pets. how many

adell [148]

Here is the answer to the given question above. Given that there are a total of 18 students and 5/9 of the students have pets, let us divide 18 by 9 to see how many students have pets. So the answer would be 2. Since it is 5 out of 9, we multiply 2 by 5 and we get 10. Therefore, the answer is 10 students. Hope this answer helps.

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3 years ago