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3 years ago

14

a team of four people participate in a 400-yard relay race each team member runs the same distance the team completes the race i

n a total of 53.2 seconds. What is the average running time for each person?

1 answer:

Elena-2011 [213]3 years ago

7 0

Answer:

13.3

Step-by-step explanation:

Four players running the same distance, so 53.2 seconds/ four people equals 13.3 seconds each

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Fred earns dollars. Chad earns 45% more than Fred which expression represents the amount of money in dollars that chad earns

Genrish500 [490]

Answer:

$0.45x

Step-by-step explanation:

Fred earns dollars. Let Fred earns $x.

Chad earns 45% more than Fred.

We need to find the expression for Chad.

Chad amount = 45% of x

$=\dfrac{45}{100}x\\\\=0.45x$

So, Chad earns $0.45x.

7 0

3 years ago

What is the main purpose of informational writing?

Eddi Din [679]

Answer:

The correct answer is:

"To inform readers about a topic using facts and details"

Step-by-step explanation:

Let us define informational writing first.

Informational writing is like communication writing which is used to convey something using facts and figures. Whatever is stated in an informational writing, it is supported by related facts and proofs.

Hence,

The correct answer is:

"To inform readers about a topic using facts and details"

4 0

3 years ago

Solve (x + 4)2 – 3(x + 4) – 3 = 0 using substitution. u = Select the solution(s) of the original equation.

bezimeni [28]

Answer:

$\dfrac{-5-\sqrt{21}}{2},\ \dfrac{-5+\sqrt{21}}{2}$

Step-by-step explanation:

For the equation $(x+4)^2-3(x+4)-3=0$ use the substitution $u=x+4.$ Then the equation will take look

$u^2-3u-3=0.$

Solve this quadratic equation:

$D=(-3)^2-4\cdot 1\cdot (-3)=9+12=21,\\ \\u_{1,2}=\dfrac{-(-3)\pm \sqrt{21}}{2}=\dfrac{3\pm\sqrt{21}}{2}.$

Thus,

$x+4=\dfrac{3-\sqrt{21}}{2}\text{ or }x+4=\dfrac{3+\sqrt{21}}{2},\\ \\x_1=\dfrac{3-\sqrt{21}}{2}-4=\dfrac{-5-\sqrt{21}}{2}\text{ or }x_2=\dfrac{3+\sqrt{21}}{2}-4=\dfrac{-5+\sqrt{21}}{2}.$

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3 years ago

Read 2 more answers

A=1/3b then b=?a i really want the answer

scoray [572]

Answer:

b=3a

Step-by-step explanation:

1/3b times 3 = b

a times 3 = 3a

4 0

3 years ago

What is the inverse of y=2x^2-8

DiKsa [7]

Answer:

f − 1 ( x ) = √ 2 ( x + 8 ) /2 , − √ 2 ( x + 8 ) /2

keep it under whole root

Step-by-step explanation:

4 0

2 years ago