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Anna35 [415]
4 years ago
13

15 playing cards are drawn at random. Some are black, and the rest are red. There are twice as many

Mathematics
1 answer:
Hunter-Best [27]4 years ago
3 0

Answer:

5 red cards

Step-by-step explanation:

2x+x=15

x is the number of red cards

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Find the surface area of each figure. Round to the nearest tenth if necessary.​
Lady bird [3.3K]

Answer:

Step-by-step explanation:

Base of triangle = b = 8 cm

Height of triangle = h = 6 cm

Length of rectangle = l = 6 cm

Sides of the triangle :  S1 = 6 cm ;  S2 = 8 cm and S3 = 10 cm

Surface area of triangular prism= bh + l *(s1+ S2 + S3)

                                                    = 8 * 6 + 6*(6+8+10)

                                                    = 48 + 6*24

                                                     = 48 + 144

                                                     = 192 square cm

3 0
3 years ago
Can someone help me with these 2 polygons and how to figure out a circumference
Svetlanka [38]

The circumference of a circle is found by using the equation: C= 2 x PI x r

Both circles have r = 1

Circumference = 2x 3.14 x 1 = 6.28.

Diameter is 2 times the radius= 2x1= 2

The ratio of the circumference to the diameter = 6.28 / 2 = 3.14 which is the value of PI

7 0
3 years ago
A mechanic estimates that a tire still has
kati45 [8]

Answer:

B

Step-by-step explanation:

100% is unknown 100:20 is 5

8,000*5=40,00

6 0
3 years ago
If z is inversely proportional to r, and z= 32 when r=1.5, find r when z=8.
lions [1.4K]
Inversely proportional: z = k/r
k = 32 * 1.5 = 48
Plug that into equation
8 = 48/r
Multiply both sides by r
8r = 48
Divide by 8
r = 6
8 0
3 years ago
A medical student is conducting a study to track boys’ weight from age 5 to age 18. The student graphs some data and determines
ollegr [7]

Answer:

A.  the increase in the number of pounds a boy gains each year

Step-by-step explanation:

Any function that can be written as:

y = ax + b

is called a linear function.

Slope of the function (or sometimes referred to as "steepness") is determined by the value of a, which is 1.73 in our case. Since y is number of boy's pounds and x is his year, that means that for every year (when x changes by 1), the boy's weight (y) will change by 1.73.

Value of a is positive (1.73), which means that for each year, from this 5 to 18 interval, boy's weight will increase.

6 0
3 years ago
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