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2 years ago

PLEASE HELP!!! Justin is running a race. He has completed 28 km, which happens to be 70% of the total race. How long is

1 answer:

8 0

Answer is 40km
Explanation:
So in this question we can use a proportion
Since
28km is 70% we can write it equal to 70%
28=70

and since 100% is unknown we can write it equal to x
100=x

Then we put it in proportion form

28/x=70/100

Then cross multiply and divide

28(100)/70=x

Which would equal 40

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Find the distance between the pair of points and then round your answer to the nearest tenth.

Travka [436]

Answer:

$d = 9.4 units$ (nearest tenth)

Step-by-step explanation:

Given the distance formula, $d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}$ , distance between (-4, 5) and (4, 0) is calculated as follows:

Let $(-4, 5) = (x_1, y_1)$

$(4, 0) = (x_2, y_2)$

$d = \sqrt{(4 - (-4))^2 + (0 - 5)^2}$

$d = \sqrt{(8)^2 + (- 5)^2}$

$d = \sqrt{64 + 25}$

$d = \sqrt{89}$

$d = 9.4 units$ (nearest tenth)

3 0

3 years ago

I need help with this . I don’t get how

Svetradugi [14.3K]

Simply collect like terms, numbers and or variables that have the same number and type of variable.

For example 15x^2 and 10x^2 are like terms. Circle the sign in front of the term to perform the correct operation.

5 0

3 years ago

Factor. x^2+25 (x+5) (x-5) (x+5) (x+5) (x+5i) (x-5i) (x+5i) (x+5i)

icang [17]

Answer:

( x + 5 i ) ( x − 5 i )

Step-by-step explanation:

Multiply the constant by − i ^2 and factor.

4 0

3 years ago

A rectangle has a length of 3.6 in, and a perimeter of 16.8 in.

zhannawk [14.2K]

Answer:

Width = 4.8 inches

Step-by-step explanation:

The perimeter of a rectangle is given by the formula:

$P=2l+2w$

Where

P is perimeter

l is length

w is width

Given length = 3.6 and perimeter = 16.8, we plug them in into the formula and figure out the width, w. Process shown below:

$P=2l+2w\\16.8=2(3.6)+2w\\16.8=7.2+2w\\16.8-7.2=2w\\9.6=2w\\w=\frac{9.6}{2}\\w=4.8$

Hence, the width is 4.8 inches

3 0

3 years ago

Find 43 ÷ 6 (as a mixed number).

Aleksandr [31]

Answer:

7 1/6

Step-by-step explanation:

43/6 = 7.167

6*7 = 42

7 1/6

8 0

3 years ago