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IrinaVladis [17]
3 years ago
7

Answer the question asked. When necessary, round to the nearest hundredth.

Mathematics
1 answer:
11111nata11111 [884]3 years ago
7 0

Answer:

0.555km p/h

shown as 555m  p/h

Step-by-step explanation:

First we convert km to meters

6k = 6000m

Time = distance / rate.

20/6 = 3.33333333 = 3hr + ( 0.33 x 60 = 19.8) - 3.20hr

then 3.33 / 6 = 0.555 km  = 555 meters p/h

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the width of a rectangle is 2 units less than the length. the area of the rectangle is 63 units.what is the length, in units, of
Mice21 [21]

Answer: 9

Step-by-step explanation:

3 0
3 years ago
Please help me....trying to get my HS diploma, i did not graduate :(
jolli1 [7]

Answer:

A.

Step-by-step explanation:

so, the equation is

h(t) = -t² + 7t

so, we need to find the solutions for t (the time when the ball is exactly 10 ft in the air). there had to be 2 solutions, as the ball first goes up passing the 10 ft height, and then comes back down again, passing the 10 ft mark a second time. and between these 2 times the ball is higher (but not equal, so, we can only use < or > as inequality signs) than 10 ft.

10 = -t² + 7t

-t² + 7t - 10 = 0

the generation solution to a quadratic equation is

x = (-b ± sqrt(b² - 4ac))/(2a)

in our case

x = t

a = -1

b = 7

c = -10

t = (-7 ± sqrt(7² - 4×-1×-10))/(2×-1) =

= (-7 ± sqrt(49 - 40))/-2 = (-7 ± sqrt(9))/-2

t1 = (-7 + 3)/-2 = -4/-2 = 2 seconds

t2 = (-7 - 3)/-2 = -10/-2 = 5 seconds

so, between 2 and 5 seconds airtime the ball is higher than 10 ft.

and remember : HIGHER THAN.

so, we cannot use any equality (like <= or >=).

t must be higher than 2 and lower than 5 :

2 < t < 5

3 0
2 years ago
FIRST ANSWER GETS BRAINLIEST
Genrish500 [490]

Answer:

c

Step-by-step explanation:

im DORA

7 0
3 years ago
Help meh pls (problem below)
Masja [62]

Answer:

44 hours

Step-by-step explanation:

Topic of this question: Creating and Solving Equations, Rates, and Proportions

<h2>Method 1: Creating and Solving Equations</h2>

Step 1: Find the amount drilled per hour

To do this, we have to divide the amount drilled by the number of hours it took to drill and find how much is being drilled per hour.

(I know it's a mouthful)

-72ft = 24x, where x is the amount drilled per hour

-72ft ÷ 24 = x

-3ft = x

-3ft per hour

Step 2: Find how many hours it takes to drill to -132 ft

Since we know the rate of drilling per hour, we can divide the target amount by the amount drilled per hour

-132 ÷ -3 = y, where y is the number of hours it takes

44 = y

y = 44

It will take a total of 44 hours to drill to -132 ft

<h2>Method 2: Proportions</h2>

We can set up a proportion like this, where we know that it takes 24 hours to drill 72 ft, but we don't know how long it takes to drill 132 feet

\frac{-72}{24} = \frac{-132}x

Cross multiply

-72x = 24 * -132

Simplify

-72x = -3168\\

Divide both sides by -72

x = -3,168/-72

x = 44

It will take a total of 44 hours to dig to -132 ft

-Chetan K

8 0
3 years ago
Read 2 more answers
Plz help!
jek_recluse [69]

Step-by-step explanation:

let's look at the last line :

x³ + 8x - 3 = Ax³ +5Ax + Bx² + 5B + Cx + D

since we find A, B, C, and D by simply comparing the factors of the various terms in x (or constants) in both sides of the equation, we need to combine a few terms on the right hand side (so that we have one term per x exponent grade).

x³ + 8x - 3 = Ax³ + (5A + C)x + Bx² + (5B + D)

by comparing now both sides, to make both sides truly equal, the factors have to be equal.

A = 1 (the same as for x³ on the left hand side).

B = 0 (a we have no x² on the left side).

5A + C = 8 (a 8 is the factor of x in the left side).

5×1 + C = 8

5 + C = 8

C = 3

5B + D = -3 (as the constant term is -3 on the left side).

5×0 + D = -3

D = -3

so, the 4th answer option is correct.

7 0
2 years ago
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