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3 years ago

FOR THE LAST TIME, HELP MEEEEEEEEE

Mathematics

1 answer:

tiny-mole [99]3 years ago

5 0

Answer:

1. Joelle spent 1¹/₂ hours reading and Rileigh spent 3/4 of that time.

To find out how much time Rileigh spent, multiply the fractions but first convert the improper fraction to a proper fraction:

= 1¹/₂ = 3/2

= 3/2 * 3/4

= 9/8

= 1¹/₈ hours

2. 1/10

3. They ate 1/6 of the donuts

They bought 18 donuts. 1/2 of 18 is 9. 1/3 of 9 is 3. To find the fraction, divide 3 by 18. Simplify the fraction. You are left with 1/6.

4. 2/3

1 1/3=4/3×1/2=4/6=2/3

And thats all on the pdf why are their only 4 Questions?

Step-by-step explanation:

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Find the exact value of the expression.<br> tan( sin−1 (2/3)− cos−1(1/7))

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Answer:

$\tan(a-b)=\frac{2\sqrt{5}-20\sqrt{3}}{5+8\sqrt{15}}$

Step-by-step explanation:

I'm going to use the following identity to help with the difference inside the tangent function there:

$\tan(a-b)=\frac{\tan(a)-\tan(b)}{1+\tan(a)\tan(b)}$

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$\cos(a)=\pm \sqrt{\frac{5}{9}}$

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$\tan(a)=\frac{2\sqrt{5}}{5}$

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Let's go ahead and say what the restrictions on $b$ are.

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So anyways $b=\cos^{-1}(\frac{1}{7})$ implies $\cos(b)=\frac{1}{7}$ .

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