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garri49 [273]
2 years ago
5

NEED HELP! Thanks!

Mathematics
1 answer:
sladkih [1.3K]2 years ago
6 0
I think the answer would be 7.5 hours or 4 hours,not so sure which one exactly

You might be interested in
Which mathematical symbol would best fill in the blank to compare the two real numbers?√7_14/5
miss Akunina [59]

Answer:

√7 is less than 14/5

Step-by-step explanation:

√7 equals about 2.6

14/5 equals 2.8

6 0
3 years ago
Help please i need it bad
evablogger [386]

Answer:

-13, -3

15, 2.6

Step-by-step explanation:

x, y are the numbers

x = 5y + 2

x×y = 39

(5y + 2)×y = 39

5y² + 2y - 39 = 0

the solution of a quadratic equation :

y = (-b ± sqrt(b² - 4ac))/2a

a = 5

b = 2

c = -39

y = (-2 ± sqrt(2² - 4×5×-39))/2×5 =

= (-2 ± sqrt(4 + 780))/10 =

= (-2 ± sqrt(784))/10 = (-2 ± 28)/10

y1 = (-2 + 28)/10 = 26/10 = 2.6

y2 = (-2 - 28)/10 = -30/10 = -3

x1 = 5×2.6 + 2 = 13 + 2 = 15

x2 = 5×-3 + 2 = -15 + 2 = -13

5 0
2 years ago
Humans can hear sounds with frequencies up to 20,000 Hz, while dolphins can hear sounds as high as 150,000 Hz. Write these numbe
Goshia [24]
20,000 Hz = 2 × 10^4 Hz

150,000 Hz = 1.5 × 10^5 Hz
4 0
2 years ago
What's (7 x 100) + (4 x /100) + (8 x 1/1000) in standard form?
IceJOKER [234]

Answer:

(7*100) can be written as 7*10^2

4 * / 100 i don’t know

if it was 4 * 100 then it’s 4*10^2

if it was divided then it’s 4*10^-2

8* 1/1000 = 8/1000 = 8*10^-3

add together to get 1.100008 * 10^3 (if it was 4*100)

or 7.00048 * 10^2 ( if it was 4/100)

7 0
2 years ago
Write an equation to find the amount of interest $450,000 earns in 1 year at a simple interest rate of 3.5%.
EleoNora [17]

Answer:

450000x.035

$15,750

..........

4 0
2 years ago
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