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
butalik [34]
3 years ago
11

An item on sale costs 70% of the original price. If the original price was $30, what is the sale price​

Mathematics
2 answers:
luda_lava [24]3 years ago
6 0

Answer:

$21

Step-by-step explanation:

70%=0.7

30*0.7=21

sweet-ann [11.9K]3 years ago
3 0

Answer:

$9.00

Step-by-step explanation:

Subtract 70 percent from 30 dollars

You might be interested in
What is the probability of rolling a single doe to the number 5 and simultaneously flipping a penny to heads?
strojnjashka [21]
B I think the answer is B 1/3
6 0
3 years ago
Read 2 more answers
A zoologist is studying four very closely related feline species. She wishes to compare their gestation periods. An observationa
diamong [38]

Answer:

p_v= 0.01

Since the significance level is 0.05 we see that pv so we have enough evidence to reject the null hypothesis. And the best conclusion for this case would be:

b. at least some, but not all, of the gestation periods across all four species are the same

Because is only to identify if AT LEAST one mean is different, NOT to conclude that the all the means are different.

Step-by-step explanation:

Previous concepts

Analysis of variance (ANOVA) "is used to analyze the differences among group means in a sample".  

The sum of squares "is the sum of the square of variation, where variation is defined as the spread between each individual value and the grand mean"  

Solution to the problem

The hypothesis for this case are:

Null hypothesis: \mu_{A}=\mu_{B}=\mu_{C}= \mu_D

Alternative hypothesis: Not all the means are equal \mu_{i}\neq \mu_{j}, i,j=A,B,C,D

In order to find the mean square between treatments (MSTR), we need to find first the sum of squares and the degrees of freedom.

If we assume that we have p=4 groups and on each group from j=1,\dots,p we have n_j individuals on each group we can define the following formulas of variation:  

SS_{total}=\sum_{j=1}^p \sum_{i=1}^{n_j} (x_{ij}-\bar x)^2  

SS_{between}=SS_{model}=\sum_{j=1}^p n_j (\bar x_{j}-\bar x)^2  

SS_{within}=SS_{error}=\sum_{j=1}^p \sum_{i=1}^{n_j} (x_{ij}-\bar x_j)^2  

And we have this property  

SST=SS_{between}+SS_{within}  

And in order to test this hypothesis we need to ue an F statistic and for this case the p value calculated is

p_v= 0.01

Since the significance level is 0.05 we see that pv so we have enough evidence to reject the null hypothesis. And the best conclusion for this case would be:

b. at least some, but not all, of the gestation periods across all four species are the same

Because is only to identify if AT LEAST one mean is different NOT to conclude that the all the means are different.

8 0
3 years ago
∠R and ∠S are complementary. If m∠R = (2x+7) and m∠S = (4x - 13), find m∠R
____ [38]

Answer:

m∠R = 39 degrees

Step-by-step explanation:

As complementary angles add up to 90 degrees, we can set up an equation to get x then find the measure of ∠R:

m∠R + m∠S = 90

2x+7+4x-13=90

6x+7-13=90

6x-6=90

6x=96

x=16

Since m∠R = (2x+7), 2x+7 would be 2(16)+7 or 39 degrees. So in conclusion, m∠R = 39 degrees

3 0
3 years ago
Read 2 more answers
What is the y-coordinate of point W?<br><br> PLS ASAP
sweet [91]
<h3>Answer:  -1.5</h3>

============================================================

Explanation:

Draw a horizontal line from W to the y axis. You should arrive somewhere between -1 and -2. While this isn't exact, it looks like we should arrive right at the middle of -1 and -2; therefore we should get to -1.5

The y coordinate of W is -1.5

Keep in mind this is based on the assumption we reach the halfway point. Unfortunately, W is not on any horizontal grid lines to be able to determine exactly where W is along the y axis.

8 0
3 years ago
What is the exact volume of the cylinder?, (a) 54in. (b) 108in. (c) 162in. (d) 324in.
lbvjy [14]
9x 6x6x3.14 = 1017.36
I followed the formula but why donMt have the answer right here
4 0
3 years ago
Other questions:
  • you want to enlarge a copy of the flag of the Philippines that is 4 in.by 8 in. The two flags will be similar how long should yo
    12·1 answer
  • Find the surface area of the cone radius 8 height 7 . Use 3.14 for pi. Explain everything.
    12·1 answer
  • One half of the birds at a pet store are yellow. Tara buys one of the yellow birds. Then one third of the birds at the store are
    12·1 answer
  • M2 = 272 182 – 2(27)(18)cos(28°) m2 = 729 324 – (972)cos(28°) m2 = 1053 – (972)cos(28°) to the nearest whole number, the value o
    8·1 answer
  • Estimate the standard deviation using the range rule of thumb of a data set with a minimum value of 176 and a maximum value of 2
    13·2 answers
  • If Ricky has 3 times as many nickels as dimes and they have a combined value of 150 cents, how many of
    11·1 answer
  • The formula for the volume of a triangular pyramid is V= 1/3Bh. Which expression can be used to find the value of B, the area of
    8·1 answer
  • Lance's math quz has eight true faise questions. How many different choices for giving answers to the eight
    6·2 answers
  • In 2 hours (x) Frank earned $31(y). In 4 hours he earned $62
    9·1 answer
  • I need help with number 10
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!