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3 years ago

7 ) Jason sold half of his comic books and then bought seven more. He now has thirteen. How many did

Mathematics

1 answer:

goblinko [34]3 years ago

8 0

Answer:

(X / 2) + 7 = 13

X=12

(12 / 2) = 6

6 + 7 = 13

X = 12

hope this helped. :D

and can I get brainliest?

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Asap po please thank you po!

eduard

Answer:

1 is correct, 100.

2 is 500, not 470. since we're rounding to the nearest hundred, we would look at the tens place and if it's higher than 5 then round up.

3 is correct.

4 is correct.

5 is correct.

6 is correct.

7 is correct.

8 is 290, not 300. like i said before, but in this case we're rounding t the nearest ten instead of hundred. but the same rules apply.

9 is correct.

and 10 is correct!

i think that you did pretty well on most of these, but remember the rounding rule.

8 0

3 years ago

A helicopter hovers 500 m above a long straight road. There is a truck to the left and right of the helicopter. The angles of de

vivado [14]

Answer:

1045.01 rounded to the nearest hundredth

Step-by-step explanation:

First, we can draw this out. The angle of depression is the angle formed by the object at the top and the line formed by the object at the top and the object at the bottom.

If the truck on the left is truck A and the truck on the right is truck B, with the helicopter being the circle on top, there is one 60 degree angle of depression and one 20 degree one. If we make a point at the point in the road the helicopter is straight above, and we connect the points, we can form two right triangles, as shown. If we can calculate the lengths of sides x and y, we can add them up to find the length between the two trucks.

Starting with side x, we know one angle and the side length adjacent to that angle. We want to find the length opposite that angle. One formula that encompasses this is tan(θ) = opposite/adjacent. Therefore, tan(60) = x/500

tan(60) = x/500

multiply both sides by 500 to isolate the x

tan(60) * 500 = x

x = 866.0254

Similarly, with side y, we can say that tan(20) = y/500 and

tan(20) * 500 = y

y= 181.9851

The distance between the two trucks can be shown as x+y, so x+y= 1045.01 rounded to the nearest hundredth

6 0

3 years ago

Find y when x=4 and z=15; if y varies jointly as x and z y=5 when z=8 and x=10

Law Incorporation [45]

I think the answer to y when x=4 and z=15; if y varies jointly as x and z y=5 when z=8 and x=10 is B. Y=1/2. Y•15; 12/4.

3 0

3 years ago

A set of data with a mean 56 and a standard deviation 3.3 is normally distributed. find 2 standard deviations from the mean

Angelina_Jolie [31]

Answer:

To the right we have 62.6 while to the left we have 49.4

Step-by-step explanation:

A normal distribution is usually symmetric with respect to the mean. The mean of the distribution is also the mode as well as the median.

The general formula for points that lie n standard deviations away from the mean on either sides of the mean is given by the formula;

mean ± n(σ)

where σ is the standard deviation of the distribution;

Two standards deviations from the mean imply that n = 2;

56 ± 2(3.3)

56 ± 6.6

To the right we have 62.6 while to the left we have 49.4

7 0

3 years ago

A bank contains 15 pennies and 12 nickels. Write<br> the ratio of nickels to pennies.

maks197457 [2]

Answer:

4:5

Step-by-step explanation:

Ratio compares two values. The ratio of nickels to pennies is:

$12:15\\4:5$

4 0

3 years ago

Read 2 more answers