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3 years ago

Erin received the following scores on her last four spelling tests.21\25, 82%, 0. 8, 17\20.

Mathematics

2 answers:

Paha777 [63]3 years ago

8 0

Answer:

The highest score is the last one 17/20

Step-by-step explanation:

Step 1: Convert all to percentage

21/25 -> 0.84 * 100 -> 84%

82%

0.8 * 100 -> 80%

17/20 -> 0.85 * 100 -> 85%

Answer: The highest score is the last one 17/20

IRISSAK [1]3 years ago

6 0

$\huge\boxed{\frac{17}{20}}$

We will convert each of the scores to a percentage.

$\frac{21}{25}*\frac{4}{4}\to\frac{21*4}{25*4}\to\frac{84}{100}\to84\%$

$82\%$

$0.8*100\to80\%$

$\boxed{\frac{17}{20}}*\frac{5}{5}\to\frac{85}{100}\to\boxed{85\%}$

So, the answer is the last option.

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3 years ago

A parallelogram has a length of 15cm and a height of 7.5cm . Calculate it’s area (step by step)

poizon [28]

Answer:

Area of parallelogram is equal to $112.5cm^2$

Step-by-step explanation:

It is given length pf parallelogram which is equal to base of parallelogram is b=15 cm

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We have to find the area of the parallelogram.

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3 years ago

AD What is the value of the expression ( 2 ^4)^2

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7 0

3 years ago

Read 2 more answers

PLEASE HELP MEEEE HURRRY!!! :)

sammy [17]

Answer:

Option D

Step-by-step explanation:

We are given the following equations -

$\begin{bmatrix}-5x-12y-43z=-136\\ -4x-14y-52z=-146\\ 21x+72y+267z=756\end{bmatrix}$

It would be best to solve this equation in matrix form. Write down the coefficients of each terms, and reduce to " row echelon form " -

$\begin{bmatrix}-5&-12&-43&-136\\ -4&-14&-52&-146\\ 21&72&267&756\end{bmatrix}$ First, I swapped the first and third rows.

$\begin{bmatrix}21&72&267&756\\ -4&-14&-52&-146\\ -5&-12&-43&-136\end{bmatrix}$ Leading coefficient of row 2 canceled.

$\begin{bmatrix}21&72&267&756\\ 0&-\frac{2}{7}&-\frac{8}{7}&-2\\ -5&-12&-43&-136\end{bmatrix}$ The start value of row 3 was canceled.

$\begin{bmatrix}21&72&267&756\\ 0&-\frac{2}{7}&-\frac{8}{7}&-2\\ 0&\frac{36}{7}&\frac{144}{7}&44\end{bmatrix}$ Matrix rows 2 and 3 were swapped.

$\begin{bmatrix}21&72&267&756\\ 0&\frac{36}{7}&\frac{144}{7}&44\\ 0&-\frac{2}{7}&-\frac{8}{7}&-2\end{bmatrix}$ Leading coefficient in row 3 was canceled.