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densk [106]
3 years ago
14

Sandra and her friend went to the candy store. Each of the purchased a bag of jelly beans. Sandra's bag weighed 1.25 pounds. Her

friend's bag weighed 1.05 pounds. Who bought more candy?
Mathematics
2 answers:
Aleks [24]3 years ago
8 0
Sandra did, her bag was .20 pounds heavier than her friend’s.
uysha [10]3 years ago
3 0
Sandra she has .20 more that her friend
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two trains leave the station at the same time one heading west and the other East the westbound train travels at 55 miles per ho
Diano4ka-milaya [45]
Recall your d = rt, distance = rate * time

so... one train goes west and the goes the opposite way... alrite... so... notice, by the time 338 miles have been covered by both, it will have been "t" hours, and whatever "t" is, is the same amount of time the westbound train has been running as well as the eastbound train has been running.

now, let's say, since by "t" hours they've covered 338 altogether, so, if the westbound train has covered say "d" miles, then the eastbound train would have covered the slack from 338 and d, that is, "338 - d".

\bf \begin{array}{lccclll}
&\stackrel{miles}{distance}&\stackrel{mph}{rate}&\stackrel{hours}{time}\\
&------&------&------\\
Westbound&d&55&t\\
Eastbound&338-d&75&t
\end{array}
\\\\\\
\begin{cases}
\boxed{d}=55t\\
338-d=75t\\
----------\\
338-\boxed{55t}=75t
\end{cases}
\\\\\\
338=75t+55t\implies 338=130t\implies \cfrac{338}{130}=t\implies \stackrel{hours}{2.6}=t

so, 2hours and 36 minutes.
8 0
3 years ago
The measure of angle θ is 600°. The point (x, y) corresponding to θ on the unit circle is ______.
eduard
A unit circle has a radius of 1. 

Θ = 600°

1 circle = 360°

Θ = 360° + 240°

(x,y) =  cos 360° , sin 240° 
(x,y) = -0.50 , -0.886

If these were the given choices: 
<span>A.) -(3^(1/2))/2     B.)-1(2^(1/2))/2           C.)-1/2         D.) (3^(1/2))/2
</span>
x = C) - 1/2
y = A) -(3^1/2) / 2
8 0
3 years ago
Read 2 more answers
QUESTION 1 The Senator of Azenator State, is worried about the rising numbers in high blood pressure related deaths in his Juris
Solnce55 [7]

Answera and Step-by-step explanation: Correlation Coefficient is the measure of how strong two variables are. There are numerous types of correlation coefficients and the product moment correlation coefficient, also known as <em>Pearson's correlation</em> or <em>Pearson's R</em> is most commonly used in linear regression. The formula to calculate it is:

r = n(∑xy) - (∑x)(∑y) / √[∑x² - (∑x)²].[n∑y² - (∑y)²]

To find the value of R:

1) Separate the values of X and Y and out them in 2 columns.

2) Add 3 more columns: for xy, x² and y²;

3) Find the values of each column;

4) Add each column;

5) Put the sum of each column in its place on the formula above;

6) Find the correlation.

i) For this question, r = 0.9645. As it's <u>positive</u>, means that the two variables are directly linked, i.e., an increase in one variable will produce an increase in the other variable in the same proportion.

ii) The Senator should distribute Norvasc to the old adults groups, because, as the <u>population grows</u>, the death associated with high blood pressure will <u>also grow</u>, as explained by the correlation coefficient.

7 0
3 years ago
If |a+3|=4 which describes all possible values of a)​
Keith_Richards [23]

Answer:

1 and -1

Step-by-step explanation:

The absolute value means that the answer will always come out as positive, meaning that both 1 and -1 fit in this equation.  

5 0
3 years ago
Read 2 more answers
The mean of 8 math quiz scores is 88. If the first seven scores are 85,70,92,85,91,100, and 88, what is the eighth quiz score? U
777dan777 [17]

Answer:

93

Step-by-step explanation:

The mean of a list of numbers is the sum of the numbers divided by the count of the numbers in the list.

In this case, representing the eighth score with x, the mean is (611+x)/8

Solving for the mean:

88=(611+x)/8

Multiply both sides by 8

8*88=611+x

704=611+x

704-611=x

x=93

3 0
3 years ago
Read 2 more answers
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