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3 years ago

Place parentheses and brackets in the expression below so that it equals 18.

Mathematics

1 answer:

Ahat [919]3 years ago

5 0

Answer:

Step-by-step explanation:

$\{{2}^{3} (4 \div 2) \}+ 2 \\ \\ = \{{2}^{3} \times 2 \} + 2 \\ \\ = {2}^{3 + 1} + 2 \\ \\ = {2}^{4} + 2 \\ \\ = 16 + 2 \\ \\ = 18$

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In triangle abc, cos A= -0.6. Find A and Tan A

Tresset [83]

Answer:

Part 1) $A=126.87^o$

Part 2) $tan(A)=-\frac{4}{3}$

Step-by-step explanation:

we have

$cos(A)=-0.6$

The cos(A) is negative, that means that the angle A in the triangle ABC is an obtuse angle and the value of the sin(A) is positive

The angle A lie on the II Quadrant

step 1

Find the measure of angle A

$cos(A)=-0.6$

using a calculator

$A=cos^{-1}(-0.6)=126.87^o$

step 2

Find the sin(A)

we know that

$sin^2(A)+cos^2(A)=1$

substitute the value of cos(A)

$sin^2(A)+(-0.6)^2=1$

$sin^2(A)=1-0.36$

$sin^2(A)=0.64$

$sin(A)=0.8$

step 3

Find tan(A)

we know that

$tan(A)=\frac{sin(A)}{cos(A)}$

substitute the values

$tan(A)=\frac{0.8}{-0.6}$

Simplify

$tan(A)=-\frac{4}{3}$

5 0

2 years ago

Please answer this correctly

pickupchik [31]

Answer:

66.7%

Step-by-step explanation:

The factors of 18 are as listed: 1, 2, 3, 6, 9, 18

Since 1, 2, 3, and 6 are in the die, that makes 4 out of the 6 numbers.

4/6 can be simplified to .667 or 66.7%

4 0

3 years ago

Read 2 more answers

Find f(-2) for the function f (x) = 3x^2-2x+7

barxatty [35]

Answer:

Step-by-step explanation:

plug -2 in for x then solve

4 0

3 years ago

What does 4/54=x/36 equal

dalvyx [7]

First reduce the fraction so your equation looks like this:

2/27=x/36

Now cross multiply to simplify

72=27x

Now change sides

27x=72

Now divide both sides by 27

X= 8/3

Now you are left with your answer:

x= 8/3

Hope this helps! :3

4 0

2 years ago

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Please help! Ill give brianliest!

Rzqust [24]

Answer:

13x-8+7x+4+3x=180

23x. =184

X=. 8

JKL=7X+4

=60

KLJ=3x

=24

LJK=13x-8

=96

5 0

3 years ago

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