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4 years ago

Please help me thank you

Mathematics

1 answer:

VashaNatasha [74]4 years ago

4 0

The answer to the first one is 9√5

the answer to the the second is √5+7⋅√5=8√5

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CAN SOMEONE HELP ME WITH THESE QUESTIONS PLEASE!?

sukhopar [10]

Answer:

Step-by-step explanation:

$(c+9)^2=64=8^2\\$

c+9=±8

either c=8-9=-1

c=-8-9=-17

so c=-1,-17

8x^2-3=2

8x^2=5

$x^2=\frac{5}{8}=\frac{10}{16}$

$x=±\frac{\sqrt{10}}{4}$

so A

$x^2+4x+4=18\\(x+2)^2=9*2\\x+2=3\sqrt{2} \\x=-2 ±3\sqrt{2}$

so D

8 0

3 years ago

Sin(cos^-1 x) how to solve?

tatiyna

Answer:

$sin(cos^{-1}x)=\sqrt{1-x^2}$

Step-by-step explanation:

let us assume

$cos^{-1} x=\theta\\x=cos\theta\\$

now

$sin(cos^{-1}x)$ can be written as $sin\theta$

we know $sin^2\theta+cos^2\theta=1$

so $sin^2\theta=1-cos^2\theta$

$sin\theta=\sqrt{1-cos^2\theta}$

now from above equation we can say that

$sin\theta=\sqrt{1-x^2}$

$sin(cos^{-1}x)=\sqrt{1-x^2}$

7 0

3 years ago

Laurie was scuba diving. Each time she dove 5 feet deeper, she would stop and clear her ears. After Laurie had checked her instr

Leona [35]

Complete question :

Answer:

(-5) * (20) * (3)

Step-by-step explanation:

Diving 5 feets deeper = descent = negative 5 Feets

Each time instrument is checked = (60/3) = depth of 20 feets

Number of times instrument is checked = 3

Hence, maximum depth :

Diving 5 feets deeper * Each time instrument is checked = depth of 20 feets * Number of times instrument is checked

(-5) * (20) * (3) = - 60

5 0

3 years ago

Karen drove her car 15 miles and used 2 gallons of gas she wants to know how many gallons she will use if she has to drive 75 mi

Airida [17]

Answer:

10 gallons of gas

Step-by-step explanation:

Create a proportion, where x is the number of gallons she will use if she drives 75 miles:

$\frac{15}{2}$ = $\frac{75}{x}$

Cross multiply and solve for x:

15x = 150

x = 10

So, she will have to use 10 gallons of gas to drive 75 miles

5 0

3 years ago

Read 2 more answers

PLS HELP EXTRA POINTS GIVEN OUT

mixer [17]

Answer:

C

Step-by-Step explanation:

6 0

3 years ago