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
Anna [14]
3 years ago
5

Multiply (2.1 x 10^3) x (3.5 x 10^2)

Mathematics
1 answer:
Westkost [7]3 years ago
6 0
The answer is A. 7.35 x 10^5
You multiply 2.1 by 3.5 and you add the exponents which are 3 and 2.

Hope this helps!
You might be interested in
What is the difference between nautical miles and miles?
Flura [38]
A nautical mile<span> is based on the circumference of the planet Earth. It is 1.15078 miles or 6076.12 feet or 1.852 kilometers
A mile is </span>a unit of linear measure equal to 5,280 feet, or 1,760 yards (approximately 1.609 kilometers).<span />
5 0
3 years ago
50 POINTS I WILL GIVE BRAINLIEST!!! HELPPPPPPPP....explain how to construct congruent line segments..
tigry1 [53]

Answer:

1. Construct a segment XY on the a sketch.

2. Elsewhere on the sketch, draw a line and create a point on the line . Label the point P.

3. Select point P and line segment XY.  Construct circle by center and radius.

4. Select the circle and line, then construct point of intersection. Label one of the points of intersection point Q.

5. Select point P and point Q.  Construct segment PQ.

6. Select the circle, line, and other point of intersection.  Hide objects.  Only segment XY and segment PQ should be visible on the sketch.

7. Try dragging point X.  Segment PQ should lengthen and shorten as segment XY does.

3 0
2 years ago
The grades on the last history exam had a mean of 75%. Assume the population of grades on history exams is known to be normally
RUDIKE [14]
34% . <span>Since going from 75% to 82% is simply the right portion of that middle, the answer is half of 68%, or 34%.</span>
6 0
3 years ago
Suppose you have a five dollar off coupon at a fabric store you buy a fabric that cost $10 per yard
Lunna [17]
<h3>Answer:</h3>

1.) 10x-5=y

2.) $85

3.) 5.25 yards of fabric.

<h3>Step-by-step explanation:</h3>

1.) To write an equation for this problem, we need to figure out what every value means:

the variable x, represents the amount of yards of fabric you can buy

the variable y, represents the total amount of money after you found out (x) or the amount of yards of fabric.

1 yard of fabric equals $10, and we have a $5 coupon (-5)

Our equation is:

10x-5=y

This equation represents the relationship between the total cost of fabric, and the amount that you can buy.

2. In order to solve this problem we need to use our equation, one value is given which is 9.

9 represents x, the amount of yards of fabric.

Substitute 9 into x:

10(9)-5=y

<h3>Solve:</h3>

90-5=y

85=y

85 represents the cost of 9 yards of fabric, including the $5 coupon.

3.) This problem is similar to #2, although it's flipped.

The value given is $47.50, which represents (y), the total amount of money after (x) was found out.

But, we need to figure out (x).

Substitute $47.50 into (y):

10(x)-5=$47.50

Next, we need to figure out x by solving the opposite.

Adding the coupon to our answer can represent 10(x).

$47.50+5=52.50

10(x)=52.50

Lastly, divide both sides of the equation by 10.

10(x) / 10=52.50 /10

x=5.25

5.25 represents the amount of yards of fabric purchased if you paid $47.50.

7 0
2 years ago
Kryptonite is a material found on the planet Krypton and has various effects, most importantly on Superman. The most common type
Rashid [163]

Answer:

The maximum amount of red kryptonite present is 33.27 g after 4.93 hours.

Step-by-step explanation:

dy/dt = y(1/t - k)

separating the variables, we have

dy/y = (1/t - k)dt

dy/y = dt/t - kdt

integrating both sides, we have

∫dy/y = ∫dt/t - ∫kdt

㏑y = ㏑t - kt + C

㏑y - ㏑t = -kt + C

㏑(y/t) = -kt + C

taking exponents of both sides, we have

\frac{y}{t} = e^{-kt + C}  \\\frac{y}{t} = e^{-kt}e^{C} \\\frac{y}{t} = Ae^{-kt}   (A = e^{C})\\y = Ate^{-kt}

when t = 1 hour, y = 15 grams. So,

y = Ate^{-kt}\\15 = A(1)e^{-kX1}\\15 = Ae^{-k}(1)

when t = 3 hours, y = 30 grams. So,

y = Ate^{-kt}\\30 = A(3)e^{-kX3}\\30 = 3Ae^{-3k} (2)

dividing (2) by (1), we have

\frac{30}{15}  = \frac{3Ae^{-3k}}{Ae^{-k}} \\2 = 3e^{-2k}\\\frac{2}{3} = e^{-2k}

taking natural logarithm of both sides, we have

-2k = ㏑(2/3)

-2k = -0.4055

k = -0.4055/-2

k = 0.203

From (1)

A = 15e^{k} \\A = 15e^{0.203} \\A = 15 X 1.225\\A = 18.36

Substituting A and k into y, we have

y = 18.36te^{-0.203t}

The maximum value of y is obtained when dy/dt = 0

dy/dt = y(1/t - k) = 0

y(1/t - k) = 0

Since y ≠ 0, (1/t - k) = 0.

So, 1/t = k

t = 1/k

So, the maximum value of y is obtained when t = 1/k = 1/0.203 = 4.93 hours

y = 18.36(1/0.203)e^{-0.203t}\\y = \frac{18.36}{0.203}e^{-0.203X1/0.203}\\y = 90.44e^{-1}\\y = 90.44 X 0.3679\\y = 33.27 g

<u>So the maximum amount of red kryptonite present is 33.27 g after 4.93 hours.</u>

3 0
3 years ago
Other questions:
  • Clarise evaluated this expression. (66.3 – 14.62) ÷ 0.6 – 0.22 (51.68) ÷ 0.6 – 0.22 (51.68) ÷ 0.42 51.68 ÷ 0.16 32.3 Which error
    8·2 answers
  • What is 55&gt; -7v +6 plzz help, this my homework
    5·1 answer
  • Explain when each method(graphing, substitution,linear combinations) is a good method to find a solution to a system of equation
    15·2 answers
  • Salina current has an account balance of $1,047.69. Her initial deposit on the account was $630 and it earned 3.9% simple intere
    6·1 answer
  • 3x^5 + 2x^2 What is the degree of this polynomial?<br><br>A. 1<br>B. 3<br>C. 5<br>D. 6​
    15·2 answers
  • It rained 1.01 inches, but 0.018 of the rain evaporated, how much rain would be left? Explain your answer.
    6·1 answer
  • PLEASE HELP WITH THIS?!!!!
    6·1 answer
  • Wave hits an object as shown.
    12·2 answers
  • What is x? Please help me??
    8·1 answer
  • 9/10 + 3/100 plz hlp in dire need of answer
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!