Brandi is downloading music for her mp3 player. albums cost $10 each, and singles cost $1 each. she wants to purchase at least 5 singles but wants to spend no more than $25 total. if brandi purchases x albums and y singles, which of the following is a possible combination of albums and singles that brandi could purchase and stay within her guidelines?

x=2 and y=5

Step-by-step explanation:

Given:

cost of Album= $10

cost of singles= $1

condition 1 :  She wants to purchase at least 5 singles

condition 2: she wants to spend no more than $25 total

Brandi purchases x albums and y singles, then combination of albums and singles that Brandi could purchase and stay within her guidelines=?

Cost of x albums= $10x

Cost of y singles= $1y

Applying condition 1, we get:

y≥5  equation i

Applying condition 2, we get:

10x+y≤25   equation ii

Solving the above two equation i and ii we get:

x=2 and y=5

So the possible combination of albums and singles that Brandi could purchase and stay within her guidelines is

10(2) + 5 =25 !

depends on how many days you are talking about

step-by-step explanation:

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation: