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Vladimir79 [104]

3 years ago

7

Tom know that in his school 10 out of every 85 students are left handed.There are 493 students in toms school.How many students

in toms school are left handed?

1 answer:

sergejj [24]3 years ago

7 0

There are <u>58 left-handed students.</u>

<h3>EXPLANATION</h3>

493 ÷ 85 = 5.8

5.8 x 10 = <u>58 students</u>

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Christopher weighs 211 pounds and has a BMI of 28.5. How many whole ponds must be gain or lose to get into the healthy BMI range

eduard

BMI = (pounds * 703) / (height^2)

so in the information you are missing the height
let's find it :)
first plug in what you know:
28.5 = (211 * 703) / (height)^2 then solve for (height)
28.5 (height)^2 = (211 * 703) multiplied both sides by (height)^2
(height)^2 = (211 * 703) / 28.5 divided both sides by 28.5
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Therefore Christopher would have to lose 26 pounds.

*Note: If the BMI you wanted to use was not 25, then just replace it like this
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5 0

3 years ago

Please help with 7, 8, and 9, please put in step by step as this is a study guide for a test!

Anika [276]

Answer:

7. f(x) = -6/7x +12/7

8a. (-∞, -3)∪(-3, ∞); b. f(6) = 2/3

9a. f(-3) = -33; b. f(5a) = -50a² +25a

Step-by-step explanation:

7. You are given two points: (2, 0), (-5, 6). It is often useful to start with the 2-point form of the equation of a line:

y = (y2 -y1)/(x2 -x1)(x -x1) +y1

y = (6 -0)/(-5-2)(x -2) +0

y = -6/7(x -2) . . . simplify

y = -6/7x +12/7 . . . slope-intercept form

f(x) = -6/7x +12/7 . . . . the desired functional form

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8.

a. The <em>domain</em> is the set of x-values for which the function is defined. It will be undefined when the denominator is zero. So, the domain is all real numbers except x=-3. That can be written as ...

-∞ < x < -3 ∪ -3 < x < ∞

b. Put 6 where x is and do the arithmetic.

$f(6)=\dfrac{6}{6+3}=\dfrac{6}{9}\\\\\boxed{f(6)=\dfrac{2}{3}}$

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9.

a. Put -3 where x is and do the arithmetic.

$f(-3)=-2(-3)^2+5(-3)=-2\cdot9-15\\\\\boxed{f(-3)=-33}$

b. Put 5a where x is and simplify.

$f(5a)=-2(5a)^2+5(5a)=-2(25a^2)+25a\\\\\boxed{f(5a)=-50a^2+25a}$

6 0

3 years ago