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2 years ago

Mary and Sam need to plant 198 trees. If Mary can plant 12 trees in 5 hours and Sam can plant 14 trees in 7 hours

Mathematics

1 answer:

34kurt2 years ago

4 0

Answer:

Step-by-step explanation:

so you wanna first add the hours

then add the number of trees painted in that number of hours

do 198 divided by 26

7.62( rounded to the nearest hundredth)

then take that product and multiply it by 12

91( rounded to the nearest one)

tha'ts your answer: 91 days

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2 The point C ( − 3 , − 1 ) C(−3, −1) is rotated 18 0 ∘ 180 ∘ clockwise about the origin. What are the coordinates of the res

Mekhanik [1.2K]

Answer:

Step-by-step explanation:

If we have the coordinate (x,y), if this coordinate is rotated by 180 degrees clockwise, the resulting coordinate will be expressed as (-x, -y) i.e the original coordinate axis are both negated.

Given the coordinate C(-3, -1), if this coordinate is rotated clockwise about the origin, the coordinate of the resulting point will be at C' (-(-3), -(-1))

C' (-(-3), -(-1))

C' = (3, 1)

Hence option A is correct

8 0

2 years ago

FAST PLEASE

nataly862011 [7]

Sorry! OK. I'll make this quick. Formula: A= A+B+C+D
A= 134 cm2
B= 170 cm2
C= 202cm2
D= 238 cm2
So, just add them altogether.
A= 744 cm (But I don't know what the exponent would be. Sorry!) I think that is how it would be. Its been a while since of done Area, though. Sorry about not knowing the exponent. And sorry if this isn't acurate.

7 0

3 years ago

Solve the equation using distributive property and properties of equality

netineya [11]

Answer: -5(8+3) = -55

Step-by-step explanation: a = 8

8 0

2 years ago

The IQ scores and English test scores of fifth grade students is given by the regression line 9 = -26.7 +0.9346s, where y is the

Phantasy [73]

Answer:

Option E) 2.68; The regression line under predicts the student's English test score.

Step-by-step explanation:

We are given the following information:

The IQ scores and English test scores of fifth grade students is given by the regression line

$y = -26.7 +0.9346s$

where y is the predicted English score and s is the IQ score.

Here English score is the predicted variable that is the dependent variable and the IQ score is the independent variable and plays the role of predictor.

An actual English test score for a student is 65.7 with an IQ of 96. We have to predict the English score with the help of regression equation.

Predicted or interpreted English score =

$y = -26.7 +0.9346(96)= 63.0216$

Thus, predicted English score is 63.0216.

Observed value of English score at IQ 96 is 65.7

Residual = Observed value - Predicted value

= $65.7 - 63.0216 = 2.6784 \approx 2.68$

Since the predicted value is less than the original or observed value we can say that the regression line under predict the English score.

Option E) 2.68; The regression line under predicts the student's English test score.

7 0

3 years ago

Solve for X and solve for Y?

Llana [10]

Answer:

$x=3\sqrt 5\\$

$y = \sqrt {126}$

Step-by-step explanation:

By geometric mean property:

$x = \sqrt{9 \times 5} = \sqrt{45} = 3 \sqrt{5} \\ \\ by \: pythagoras \: theorem \\ \\ {y}^{2} = {9}^{2} + {x}^{2} \\ \\ {y}^{2} = {9}^{2} + {(3 \sqrt{5}) }^{2} \\ \\ {y}^{2} = 81 + 45 \\ \\ {y}^{2} = 126 \\ \\ y = \sqrt{126}$

7 0

2 years ago