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3 years ago

If you answer 9 questions incorrectly on your science test you will earn a score of 70%. How many total

Mathematics

2 answers:

solmaris [256]3 years ago

8 0

Answer:

The total of questions is 30

Step-by-step explanation:

If with 9 incoreccet answer we get 70%

9 incorect answers equal 100% -70% = 30%

The number of questions for 70% is

9/30x70=21

Total of questions= 21+9=100

Verification

21/30x100=70%

Dmitrij [34]3 years ago

4 0

Answer:

30 questions on the test

Step-by-step explanation:

You might be interested in

Which equation represents a line that is parallel to the line whose equation is 2x + 3y =12

STALIN [3.7K]

Answer:

Choose an equation that has this same slope or the same coefficients of x and y - 2x + 3y.

Step-by-step explanation:

Parallel lines are lines which do not intersect. As a result they have the same slope. The line here is 2x + 3y = 12 which can be rearranged into slope intercept form to find the slope.

2x + 3y = 12

3y = 12 - 2x

y = 4 - 2/3 x

The slope of the line is -2/3. Choose an equation that has this same slope or the same coefficients of x and y - 2x + 3y.

3 0

3 years ago

In the figure above, point O is the center of the circle,

snow_tiger [21]

Answer:

16.67 or 16 2/3

Step-by-step explanation:

so, as BC is a tangent, it means the angle OBC is 90 degrees.

therefore, the angle BOC is 180 - 90 - 30 = 60 degrees.

that means the angle AOB is 180 - 60 = 120 degrees.

the triangle ABO must be an isosceles triangle, as the sides are both the radius of the circle. so, both remaining angles are the same : half of 180 - 120 = 60 = 30 degrees.

and so, we know that ABC is an isosceles triangle, because both "side angles" are equal = 30 degrees.

so, AB = BC.

and we know the circumference of the circle (50) and can calculate the radius

50 = 2×pi×r

25 = pi×r

r = 25/pi ≈ 7.96

now we have multiple ways to calculate AB.

AB = BC = tan(60) × r

AB = sqrt(r² + r² - 2×r×r×cos(120))

or ...

the first one might be easiest.

AB = tan(60) × 7.96 ≈ 13.78

oh, I just recognized, we need the arc AB (not the straight line).

even easier.

50 is the full "arc" of the circle for all 360 degrees.

but we only need the part of the angle AOB = 120 degrees.

so, this is then only the 120/360 part of the full circle circumference.

ABarc = 50 × 120/360 = 50 / 3 ≈ 16.67 or 16 2/3

8 0

3 years ago

50 POINTS AWARDED PLEASE ANSWER THE QUESTION RIGHT AND YOU WILL GET BRAINLESS ANSWER A THANK YOU A FRIEND REQUEST PLEASE DON'T J

zepelin [54]

The answer is 35x=700 because you would divide 700 by 35 to get the amount of months that you've spent. So x will equal the amount of months.

6 0

3 years ago

How do I solve this one?

UkoKoshka [18]

If I am not wrong...It would be: 50x30x5=7500 feet³

4 0

3 years ago

Read 2 more answers

An environmental scientist estimated the number of drops of water in two different jugs. He estimated that the smaller jug conta

s344n2d4d5 [400]

Answer:

The difference the number of drops of water in the larger jug and the number of drops of water in the smaller jug is <u>1,472,000.0000000005</u>.

Step-by-step explanation:

Given:

An environmental scientist estimated the number of drops of water in two different jugs. He estimated that the smaller jug contains 808,000 drops of water and the larger jug contains 2,280,000.0000000005 drops of water.

Now, to find the difference between the number of drops of water in the larger jug and the number of drops of water in the smaller jug.

The drops of water larger jug contains = 2,280,000.0000000005.

The drops of water smaller jug contains = 808,000.

Now, to get the difference between the number of drops of water in the larger jug and the number of drops of water in the smaller jug we subtract:

$2,280,000.0000000005-808,000\\\\=1,472,000.0000000005.$

Therefore, the difference the number of drops of water in the larger jug and the number of drops of water in the smaller jug is 1,472,000.0000000005.

7 0

3 years ago