1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
STALIN [3.7K]
3 years ago
14

Really need help Five less than twice what negative number squared is 157?

Mathematics
1 answer:
Cerrena [4.2K]3 years ago
5 0

Answer:

-9

Step-by-step explanation:

2(-x)² - 5 = 157

2x² - 5 = 157

add 5 to each side of the equation:

2x² = 162

divide both sides by 2:

x² = 81

√81 = 9 or -9

You might be interested in
URGENT, According to the graph below , the slope of line B is
ra1l [238]

Answer:

the answer is 3/2

Step-by-step explanation:

the formula of the slope is

3 0
2 years ago
Read 2 more answers
There are 48 students going on a field trip and 1/4 are girls how many boys are going on the field trip? In tape diagram
Sedaia [141]

Answer:

3/4 or 75% are boys

Step-by-step explanation:

4 0
3 years ago
Which expression is equivalent to 9^-2?<br> –81<br> –18<br> 1/81<br> 1/18
Kaylis [27]
(9)^-2 = (1/9)^2 = 1/81

5 0
3 years ago
Read 2 more answers
WILL GIVE BRAINLIEST
Evgesh-ka [11]
All you have to do is plug in the given values into the given equation and evaluate.

The expression is,

A(t) =  l{e}^{rt}
But we have to analyze the problem carefully. This is a natural phenomenon that can be modelled by a decay function. The reason is that, after every hour we expect the medicine in the blood to keep reducing.

Therefore we use the decay function rather. This is given by,


A(t) =  l{e}^{-rt}

where,

l = 100 \: milligrams

r =  \frac{14}{100}  = 0.14

and

t = 10 \: hours

On substitution, we obtain;

A(10) =  100 \times {e}^{ - 0.14 \times 10}


A(10) =  100 \times {e}^{ - 1.4}



Now, we take our calculators and look for the constant
e

,then type e raised to exponent of -1.4. If you are using a scientific or programmable calculator you will find this constant as a secondary function. Remember it is the base of the Natural logarithm.



If everything goes well, you should obtain;

A(10) =  100 \times 0.24659639


This implies that,


A(10) =  24.66

Therefore after 10 hours 24.66 mg of the medicine will still remain in the system.
3 0
3 years ago
Simplify.<br><br> x8 ÷ x4 · x2
miskamm [114]
<span>x^8 ÷ x^4 · x^2
= </span>x^4 · x^2
= x^6

hope it helps
5 0
3 years ago
Other questions:
  • 20 points<br><br> What is the square root of -16?<br><br> -8i<br> -4i<br> 4i<br> 8i
    6·2 answers
  • John sent 45 text messages in 9 minutes. What is the unit rate? Explain your answer.
    15·1 answer
  • What fraction is equivalent to 64/66?
    15·1 answer
  • A water sprinkler covers a circular area with a diameter of 20 feet. If it is set to cover only an arc measuring 120 degrees, wh
    12·1 answer
  • Factorize fully the following a) 2x + 10
    9·2 answers
  • HELP PLEASE!!! I WILL FIVE STAR!!
    13·1 answer
  • Choose the correct answer.
    11·1 answer
  • If a/2 = b/3, then b/a = ?<br><br> A. 3/2<br><br> B. 2/3
    7·1 answer
  • Mary ran 2 miles in about 23 minutes. If she continued at the same pace, how long will it take her to run 10 miles?
    7·1 answer
  • What is the slope between (-4,0) and (0,2)
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!