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2 years ago

Holly finds that (11m – 13n + 6mn) – (10m – 7n + 3mn) = m – 20n + 9mn. What error did Holly make?

Mathematics

2 answers:

jekas [21]2 years ago

6 0

She added the polynomials instead of subtracting.

notsponge [240]2 years ago

4 0

Answer:

A.)she only used the additive inverse of 10m when combining like te

Step-by-step explanation:

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A quilt is designed using a square pattern. Each square contains two rectangles. Each rectangle contains a shaded rhombus.

Alisiya [41]

Answer:

The value of x is 55 ⇒ 2nd answer

Step-by-step explanation:

* Lets revise the properties of the rhombus

- It has 4 equal sides

- Every two opposite sides are parallel

- Every two opposite angles are equal

- Every two adjacent angles are supplementary (their sum is 180°)

* Now lets solve the problem

- A square divided into two rectangles

- Each rectangle contains a shaded rhombus

- The shaded rhombus has two adjacent angles their measures are

(2x + 20)° and 50°

∵ Every two adjacent angles in the rhombus are supplementary

∵ The sum of the supplementary angles = 180°

∴ The sum of the measures of the angles (2x + 20)° and 50° is 180°

- lets put the equation and solve it to find x

∴ (2x + 20)° + 50° = 180° ⇒ add the like terms

∴ 2x + 70° = 180° ⇒ subtract 70° from both sides

∴ 2x = 110° ⇒ divide both sides by 2

∴ x = 55°

* The value of x is 55

7 0

2 years ago

Read 2 more answers

A store sells both cold and hot beverages. Cold beverages, c, cost $1.50, while hot beverages, h, cost $2.00. On Saturday, drink

Marina86 [1]

2h + 4h (1.5c) = 360 so option b is correct.

3 0

2 years ago

Read 2 more answers

Which decimal is equivalent to \dfrac{4}{3} 3 4 start fraction, 4, divided by, 3, end fraction? Choose 1 answer: Choose 1 answ

Otrada [13]

Answer:

The correct option is option D.

Step-by-step explanation:

Any fraction number $\frac mn$ (m>n ) can be written as $a\frac bn$

where a = quotient

b= reminder.

Given number is $\frac{4}{3}$ .

3)4( 1 ← quotient

- 3

____

1 ← reminder

Here quotient= 1, reminder=1 and n=3

$\therefore \frac43=1\frac13$ .

7 0

2 years ago

The mean yearly rainfall in Sydney, Australia, is about 134 mm and the standard deviation is about 66 mm ("Annual maximums of,"

svetlana [45]

Answer:

At least 202.44 mm in the top 15%.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

$\mu = 134, \sigma = 66$