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
sergejj [24]
3 years ago
6

Use mental math to find the unknown number in the equation 12 x b= 480

Mathematics
2 answers:
makkiz [27]3 years ago
5 0
So find out what times twelve equals 48. Then add a zero in front and that is your answer.
lorasvet [3.4K]3 years ago
5 0
Divide 12 over 480 and there's your answer. there's an app you can download that will give you the answers plus show you how to do the problems
You might be interested in
A swimming pool has to be drained for maintenance. The pool is shaped like a cylinder with a diameter of 10 m and a depth of 1.7
love history [14]
About  ten days or so
3 0
3 years ago
A person can read 48 pages in 5/4 of an hour. How many pages can they read in one hour
erma4kov [3.2K]

Answer:

38.4 pages

Step-by-step explanation:

5/4 = 1.25

Rate =  pages / Time

Time = 1.25 hours

Pages = 48

Rate = 48/1.25

Rate = 38.4    

8 0
3 years ago
An article in Fire Technology investigated two different foam-expanding agents that can be used in the nozzles of firefighting s
UNO [17]

Answer:

Step-by-step explanation:

Hello!

The objective of this experiment is to test if two different foam-expanding agents have the same foam expansion capacity

Sample 1 (aqueous film forming foam)

n₁= 5

X[bar]₁= 4.7

S₁= 0.6

Sample 2 (alcohol-type concentrates )

n₂= 5

X[bar]₂= 6.8

S₂= 0.8

Both variables have a normal distribution and σ₁²= σ₂²= σ²= ?

The statistic to use to make the estimation and the hypothesis test is the t-statistic for independent samples.:

t= \frac{(X[bar]_1 - X[bar]_2) - (mu_1 - mu_2)}{Sa*\sqrt{\frac{1}{n_1} + \frac{1}{n_2 } } }

a) 95% CI

(X[bar]_1 - X[bar]_2) ± t_{n_1 + n_2 - 2}*Sa* \sqrt{\frac{1}{n_1}+\frac{1}{n_2} }

Sa²= \frac{(n_1-1)S_1^2 + (n_2-1)S_2^2}{n_1 + n_2 - 2}= \frac{(5-1)0.36 + (5-1)0.64}{5 + 5 - 2}= 0.5

Sa= 0.707ç

t_{n_1 + n_2 -2: 1 - \alpha /2} = t_{8; 0.975} = 2.306

(4.7-6.9) ± 2.306* (0.707\sqrt{\frac{1}{5}+\frac{1}{5} })

[-4.78; 0.38]

With a 95% confidence level you expect that the interval [-4.78; 0.38] will contain the population mean of the expansion capacity of both agents.

b.

The hypothesis is:

H₀: μ₁ - μ₂= 0

H₁: μ₁ - μ₂≠ 0

α: 0.05

The interval contains the cero, so the decision is to reject the null hypothesis.

<u>Complete question</u>

a. Find a 95% confidence interval on the difference in mean foam expansion of these two agents.

b. Based on the confidence interval, is there evidence to support the claim that there is no difference in mean foam expansion of these two agents?

8 0
3 years ago
Pippi sold ten more cups of lemonade that cups of iced tea. She sold 120 cups in all. How many cups of lemonade did she sell?
Kamila [148]

Answer:

65  cups

Step-by-step explanation:

If she sold 10 more cups of lemonade than tea and sold 120 cups total.  I first would subtract 10 cups from 120 =110.  then I divide 110 /2 = 55 cups

The 55 cups makes it equal then I add the 10 cups back to the Lemonade to get 55+10 = 65

So your answer would be 65 cups of lemonade

7 0
2 years ago
Need help please with this question
SashulF [63]

Answer:

5/8

5/8

Step-by-step explanation:

5 0
3 years ago
Other questions:
  • The length of a rectangle is five centimeters more than its width, w. If the perimeter of the rectangle is 26 centimeters, what
    6·1 answer
  • What is the value of d + e + f when d = 20, e = –4 and f = –2?
    10·1 answer
  • Solve the expression.<br> 2^3 + 17 - 3g4 = ?
    10·1 answer
  • Graph the linear equation. Find three points that solve the equation, then plot them on the graph. EQUATION: x-4y= -18
    8·1 answer
  • Mitch's father needs 1 and a half tons of gravel he bought 1750 pounds of gravel How many more pounds of gravel does he need??
    8·1 answer
  • X to the power of 2 equals to negative 25
    8·1 answer
  • Roberta needs 12 zippers to make 3 of the same backpacks. If Roberta has 48 zippers, how many of those same backpacks can she ma
    9·1 answer
  • Jose bought 1.5 pounds of apples for $3.60. How much would 3/4 of a pound of apples cost?
    15·2 answers
  • ..................Help please!
    10·1 answer
  • M∠1 = _°<br><br> •35<br><br> •65<br><br> •50
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!