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2 years ago

Describe how to use a tens fact to find the difference for 15-8

Mathematics

2 answers:

lutik1710 [3]2 years ago

8 0

you can round 15 to 20 and 8 and to 10

Svet_ta [14]2 years ago

3 0

How to use mental strategies to subtract within 20 using the "break down to 10" strategy? With practice, this strategy can help students gain fluency when subtracting within 20. By now children should be very comfortable with the sum-equals-ten addition and subtraction facts, such as 4+6=10 and 10-7=3.

Write 15-8=? on the board. Explain that:

1. 15=10+5;

2. 8=5+3;

3. 15-8=10+5-5-3=10-3=7.

Answer: 15-8=7.

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What is the height of the box

PSYCHO15rus [73]

Answer:

8 in

Step-by-step explanation:

since the box is the same length in all sides, it is a cube.

length, width and height are all the same.

the volume is 512 in³.

and the volume of a cube is length×width×height = side length³.

512 = length³

length = 8 = width = height

7 0

2 years ago

The fish population of Lake Collins is decreasing at a rate of 5% per year. In 2004 there were about 1,350 fish. Write an expone

ad-work [718]

Answer:

Part 1) The exponential function is equal to $y=1,350(0.95)^{x}$

Part 2) The population in 2010 was $992\ fish$

Step-by-step explanation:

Part 1) Write an exponential decay function that models this situation

we know that

In this problem we have a exponential function of the form

$y=a(b)^{x}$

where

y ----> the fish population of Lake Collins since 2004

x ----> the time in years

a is the initial value

b is the base

we have

$a=1,350\ fish$

$b=(100\%-5\%)=95\%=0.95$

substitute

$y=1,350(0.95)^{x}$ ----> exponential function that represent this scenario

Part 2) Find the population in 2010

we have

$y=1,350(0.95)^{x}$

For $x=(2010-2004)=6\ years$

substitute

$y=1,350(0.95)^{6}=992\ fish$

7 0

3 years ago

Let H = {1J4, (1 2)(3 4), (1 3)(2 4), (1 4)(2 3)

Monica [59]

Answer:

Please see attachment

Step-by-step explanation:

Please see attachment

3 0

2 years ago

In a writing competition, the first place winner receives 1/2 of the prize money. The second runner up receives 1/4 of what the

worty [1.4K]

Answer:

10,000 is the total amount of.money that was distributed

6 0

2 years ago

PLS HELP ME I ONLY HAVE # HOURS TO COMPLETE I WILL MARK THE BRAINLIEST!!!

nata0808 [166]

triangle on right is the same as the triangle on the left

use pythagorean theorem

hypotenuse will give to the sides of the rectangle

a^2 + b^2 = hypotenuse squared

10.4^2 = 108.16

15.3^2 = 234.09

342.25 = hypotenuse squared

take the square root in both sides

hypotenuse = the square root of 342.25 =

18.5

add up the areas of the 2 triangles and rectangle

triangle area is 1/2 times 10.4 times 15.3 =

79.56

2 triangles areas are 159.12

rectangle area is 18.5 × 7 = 129.5

159.12 + 129.5 = 288.62

answer 1 = 288.62

second question:

to get 1 side take the

square root of 702.25 which is

26.5

to get the perimeter

multiply 26.5 by 4 which is

106

answer 2 is choice B 106

3 0

2 years ago