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3 years ago

You earn a 90% on his science test you answer 18 questions correctly how many questions were on the test

Mathematics

2 answers:

Bogdan [553]3 years ago

8 0

Hello there!

The correct answer is 20.

Hope This Helps You!
Good Luck :)

gogolik [260]3 years ago

5 0

We can write a ratio equation 90/100 =18/x to show how many problems he got right on his science test.

We can cross multiply to simplify our equation to 90x=1800.

Now we divide by 90 on both sides to get x=20.

There were 20 questions on the science test, if you answered 18 questions correct, your test score would be a 90%.

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Find the Length of AC. Round answers to the nearest hundredth (2 decimal places)

lara31 [8.8K]

Answer:

32.78

Step-by-step explanation:

Assuming that we have two right triangles joined together, with one having adjacent side a, with a side of 12 ft opposite reference angle 30°, and the other one having adjacent side b, with a side of 12 ft opposite reference angle 45°. Thus, a + b = length of AC.

Let's find a and b.

Finding a:

Reference angle = 30°

Opp = 12 ft

Adj = a

Using trigonometric ratio formula, we have:

tan(30) = 12/a

Multiply both sides by a

a*tan(30) = 12

Divide both sides by tan(30)

a = 12/tan(30)

a = 20.78 (nearest hundredth)

Finding b:

Reference angle = 45°

Opp = 12 ft

Adj = b

Using trigonometric ratio formula, we have:

tan(45) = 12/b

Multiply both sides by a

b*tan(45) = 12

Divide both sides by tan(45)

b = 12/tan(45)

a = 12

Length of AC = 20.78 + 12 = 32.78

5 0

3 years ago

One day at 3:00 a.m., the temperture was -13 degrees F in Kodiak ,Alaska. At 10:00 a.m. the temperature was 22 degrees F. what w

Ksju [112]

The average change in temperature is +5 degrees every 1 hour.

8 0

3 years ago

Read 2 more answers

The amount of chlorine in a swimming pool is proportional to the volume of water. The pool has 2.5 milligrams of chlorine per li

stira [4]

Answer:

There are <u>20,000 milligrams</u> chlorine in the pool.

Step-by-step explanation:

Given:

The chlorine per liter of water in the pool is 2.5 milligrams.

The volume of water in the swimming pool is 8000 gallons.

Now, to find the quantity of chlorine in the pool.

Let the quantity of chlorine be $x.$

The gallons of water in the swimming pool = 8000.

The milligrams of chlorine per liter of water in the pool = 2.5.

According to question, the amount of chlorine in the swimming pool is proportional to the volume of water.

So, 2.5 mg of chlorine is equivalent to 1 liter.

Thus, $x$ is equivalent to $8000.$

Now, to get the quantity of chlorine by using cross multiplication method:

$\frac{2.5}{1} =\frac{x}{8000}$

<em>By cross multiplying we get:</em>

$20000=x\\\\x=20,000\ mg.$

Therefore, there are 20,000 milligram chlorine in the pool.

6 0

3 years ago

PLEASE HELP! BRAINLIEST!

xz_007 [3.2K]

Answer:

11 - 3x = 75 - -1x

X = -16

Hope this helps

:0 can I have brainliest

Step-by-step explanation:

4 0

3 years ago

Please help me with this one.

borishaifa [10]

Answer:

V = 16
W = 48

Step-by-step explanation:

The triangles are congruent when corresponding sides are congruent.

ΔFGH ≅ ΔABC means corresponding sides are ...

(GH, BC) = (V, 16)

(HF, CA) = (48, W)

Corresponding sides being congruent means ...

V = 16

W = 48

5 0

2 years ago