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Anon25 [30]
3 years ago
13

Evaluate b^2 + 5a – 20

Mathematics
1 answer:
Rina8888 [55]3 years ago
7 0

Answer: it cant even be factored

Step-by-step explanation:

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Chang made $156 for 13 hours of work at the same rate, how many hours would he have to work to make $108?
sdas [7]

Answer:

  9 hours

Step-by-step explanation:

"At the same rate" means time and wages are proportional.

  time/wages = t/$108 = (13 h)/$156

  t = 108(13 h)/156 . . . . . . . . . . . . . . . units of dollars cancel

  t = 9 h

Chang would have to work 9 hours to make $108.

8 0
3 years ago
Please help! Will mark brainlyest. :)
Elden [556K]

Answer:

48

Step-by-step explanation:

base times hight times times 1/2

24X4X1/2

7 0
2 years ago
Read 2 more answers
A 30 gram sample of a substance that's used to sterilize surgical instruments has a k-value of 0.1235. Find the substances half
jok3333 [9.3K]

Answer : The substances half life in days is, 5.6 days.

Step-by-step explanation :

Half life : It is defined as the amount of time taken by a radioactive material to decay to half of its original value.

All radioactive decays follow first order kinetics.

The relation between the half-life and rate constant is:

k=\frac{0.693}{t_{1/2}}

where,

k = rate constant = 0.1235 per days

t_{1/2} = half-life

Now put all the given values in the above formula, we get:

0.1235\text {days}^{-1}=\frac{0.693}{t_{1/2}}

t_{1/2}=5.6\text{ days}

Thus, the substances half life in days is, 5.6 days.

5 0
3 years ago
CAN SOMEONE HELP ME!!!!!
Ivenika [448]
Area yellow =11 x 6
= 66
red area = 7 x 2
=14
area of yellow
66 - 14 = 52
7 0
3 years ago
Kim is reading a book with 380 pages. She read 20 pages each day until she reached Part 2 of the book. Part 2 of the book is 160
o-na [289]

Answer:

11 days

Step-by-step explanation:

380-160=220

20 times 11 =220

answer 11 days

5 0
3 years ago
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