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nalin [4]
3 years ago
10

Please help!!! I've been trying to figure this out all day!

Mathematics
1 answer:
MrRa [10]3 years ago
3 0

Answer:

.55(220-a) + .90(220-a)

Step-by-step explanation:

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Which of the following terms can be combined in this expression? -3-x/5+6.2y+20.5x-3/8y
mojhsa [17]

Answer:

-\frac{x}{5} and 20.5x

-\frac{3}{8}y and 6.2y

Step-by-step explanation:

-3-x/5+6.2y+20.5x-3/8y

-3-\frac{x}{5}+6.2y+20.5x- \frac{3}{8} y

We are given an expression with 5 terms

The terms that has same variables with same exponent are like terms. WE combine only like terms. Constants are also like terms.

In the given expression , the fractions -\frac{x}{5} and 20.5x have same 'x' . so they are like terms. we can combine these terms.

the fractions -\frac{3}{8}y and 6.2y have same 'y' . so they are like terms. we can combine these terms.

8 0
3 years ago
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Estimate the solution to the following system of equations by graphing.
notka56 [123]

Answer:

(2.405, 1.537)

Step-by-step explanation:

When you graph these, they intersect at (2.405, 1.537).

You can use desmos as a graphing calculator, it is extremely helpful.

Hope this helps!

3 0
2 years ago
In the past year Jenny watched 44 movies that she thought were very good. She watched 55 movies over the whole year. Of the movi
igomit [66]

To solve this problem, we must divide the number of movies that Jenny thought were very good by the total number of movies she watched. This is because we are finding a percentage, which represents a part out of a whole that have a factor, which in this case is very good movies. First, we begin by dividing 44/55. Then, we realize that both the numerator and the denominator are divisible by 11, so if we divided them both by 11 that would simplify the fraction.

44/55 = 44/11 / 55/11 = 4/5

Next, we can now easily divide our simplified fraction.

4/5 = 0.8

Finally, we must multiply by 100, because a percentage is a portion of 100 (the total is 100%). This is equivalent to moving the decimal point two places to the right.

0.8 * 100 = 80%

Therefore, Jenny thinks that 80% of the movies she watched this year were very good.

Hope this helps!

7 0
3 years ago
Please Help! A bag contains four green marbles and five yellow marbles. You randomly select three marbles. What is the probabili
maxonik [38]

Answer:

A. 0.088

B. 0.048

C. 1.83 times

Step-by-step explanation:

From the question given above, the following data were obtained:

Green (G) = 4

Yellow (Y) = 5

Total = 4 + 5 = 9

A. Determination of the probability of selecting three green marbles with replacement.

Green (G) = 4

Yellow (Y) = 5

Total = 9

P(1st G) = 4/9

P(2nd G) = 4/9

P(3rd G) = 4/9

P(all G) = P(1st G) × P(2nd G) × P(3rd G)

P(all G) = 4/9 × 4/9 × 4/9

P(all G) = 64/729

P(all G) = 0.088

B. Determination of the probability of selecting three green marbles without replacement.

Green (G) = 4

Yellow (Y) = 5

Total = 9

P(1st G) = 4/9

P(2nd G) = 3/8

P(3rd G) = 2/7

P(all G) = P(1st G) × P(2nd G) × P(3rd G)

P(all G) = 4/9 × 3/8 × 2/7

P(all G) = 24/504

P(all G) = 0.048

C. Comparing probability of replacement and without replacement.

P(all G with replacement) = A = 0.088

P(all G without replacement) = B = 0.048

A/B = 0.088/0.048

A/B = 1.83

Cross multiply

A = 1.83 × B

Thus,

P(all G with replacement) = 1.83 × P(all G without replacement)

5 0
4 years ago
Seth drinks a glass of orange juice every day that contains 0.6 grams of Vitamin C. He eats a serving of strawberries for snack
belka [17]

Answer:

3 week or 21 days consume Vitamin C = 19.95 grams

Step-by-step explanation:

given data

orange juice Vitamin C = 0.6 grams

strawberries Vitamin C = 0.35 grams

to find out

How many grams of Vitamin C does Seth consume in 3 weeks

solution

we first find total Vitamin C consume in 1 day that is

total Vitamin C consume in 1 day = orange juice Vitamin C  + strawberries Vitamin C

total Vitamin C consume in 1 day  = 0.6  + 0.35

total Vitamin C consume in 1 day  = 0.95 grams

so

in 3 week have 3 × 7 = 21 days

so in 21 days consume Vitamin C = 1 day consume × no of days consume

21 days consume Vitamin C = 0.95 × 21

21 days consume Vitamin C = 19.95 grams

5 0
4 years ago
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