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wel
4 years ago
10

Please!! Can also show me your work?

Mathematics
1 answer:
ycow [4]4 years ago
8 0

Multiply the total hours by each portion:

Ally = 60 hours x 0.4 = 24 hours.

Megan = 60 x 1/4 = 60 x 0.25 = 15 hours.

Rachel and Liz = 60 hours - 24 hours - 15 hours = 21 hours total.

Rachel and Liz shared equally so 21 / 2 = 10.5 hours each.

Liz babysat 10.5 hours ( 10 and 1/2 hours).

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(Probability with Permutations and Combinations) I’m not sure how to solve this problem/how to get the answer, need help!
tekilochka [14]
The "explanation" for the problem has a typo in it. There are 11 possible ice cream/yogurt flavors to choose from, regardless of whether any are low-fat, so the total number of ways of choosing any 2 from the selection is

11\mathrm C2=\dfrac{11!}{2!(11-2)!}=55


In particular we want to count the number of ways of picking 1 ice cream and 1 yogurt flavor from the low-fat variety. There are 6 total choices that are not low-fat of which we choose 0, 3 choices of low-fat ice cream of which we choose 1, and 2 choices of low-fat yogurt of which we also choose 1. In terms of the binomial coefficient, this is

(6\mathrm C0)\cdot(3\mathrm C1)\cdot(2\mathrm C1)=1\cdot3\cdot2=6

So the probability of getting such a combination is \dfrac6{55}.
3 0
3 years ago
Is 40mi+98mi+104mi= a right triangle
alexira [117]

Answer:

no

Step-by-step explanation:

A right triangle consists of one angle being 90 degrees. Contrast to this picture, the triangle has no angle of 90 degrees.

5 0
3 years ago
Anyone wanna keep me comany? lol
MariettaO [177]

Answer:

Sure.

Step-by-step explanation:

easy answer

yes x no = sure

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6 0
3 years ago
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Find all that are rational numbers
timama [110]

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Step-by-step explanation:

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WILL GIVE BRAINLIES- ARITHMETIC SEQUENCE
BigorU [14]

Answer:

2,322,775

Step-by-step explanation:

a_1=4\\\\a_i=a_{i-1}+11\\\\\implies a_2=a_{2-1}+11\\a_2= a_1+11 \\a_2= 4+11 \\a_2= 15\\\\d = a_2-a_1 \\d= 15-4 \\d= 11\\\\S_{650}=?\\\\\implies n = 650\\\\

By the formula of sum of an Arithmetic Sequence

S_n= \frac{n}{2} [2a_1+(n-1)d]\\\\S_{650}= \frac{650}{2} [2\times 4+(650-1)\times 11]\\\\S_{650}= 325 [8+649\times 11]\\\\S_{650}= 325 [8+7,139]\\\\S_{650}= 325\times 7,147\\\\\huge \red {\boxed {S_{650}=2,322,775}}

4 0
3 years ago
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