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olga nikolaevna [1]
3 years ago
12

Alyssa took a math test with 20 questions and she answered 16 questions correctly. In order get an A she needs to answer at leas

t 90 percent of the questions correctly
Mathematics
1 answer:
Tatiana [17]3 years ago
5 0

Answer:

she got 80% . in order to get 90% she would have had to get 18 questions right

Step-by-step explanation:

20=100%

2=10%

2×9=90%

18=90%

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Fort the first equation just click on the photo and for the second it’s x-y=-1

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What is 3 1/8 - 1/2
irina1246 [14]

Answer:

\frac{21}{8}

Step-by-step explanation:

Given: 3\frac{1}{8} - \frac{1}{2}

Let's changed that mixed number to an improper fraction. Now we get:

\frac{25}{8} - \frac{1}{2}

Let's find out least common denominator. This one is easy, the LCD is 8. Now that we know the LCD, let's convert both our fractions:

\frac{25}{8} - \frac{4}{8}

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3 years ago
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In Martin's class of 20 students, 4 students report that social studies is their favorite class and 75% of the students report t
gayaneshka [121]

Answer:

More students like PE

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4×5=20

20% students favourite is social studies

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4 0
3 years ago
Please help me!!!!!!!!!!!
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Answer:

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Find the slope of the line joining the points (-1,5) and (6,-2). Also find the equation of that straight line. Find the intercep
Nesterboy [21]

The slope of the line joining the points (-1,5) and (6,-2) is -1

x + y = 4 is the equation of line

x intercept is (-4, 0)

y intercept is (0, 4)

<em><u>Solution:</u></em>

Given that,

Points are (-1,5) and (6,-2)

<em><u>The slope of line is given as:</u></em>

m = \frac{y_2-y_1}{x_2-x_1}

From given,

(x_1, y_1) = (-1, 5)\\\\(x_2, y_2) = (6, -2)

Substituting the values we get,

m = \frac{-2-5}{6+1}\\\\m = \frac{-7}{7}\\\\m = -1

Thus slope of line is -1

<em><u>The equation of line in slope intercept form is given as:</u></em>

y = mx + c -------- eqn 1

Where,

m is the slope

c is the y intercept

Substitute m = -1 and (x, y) = (-1, 5) in eqn 1

5 = -1(-1) + c

5 = 1 + c

c = 4

Substitute m = -1 and c = 4 in eqn 1

y = -x + 4

In standard form,

x + y = 4 is the equation of line

<em><u>Find x intercept:</u></em>

Substitute y = 0

x + 0 = 4

x = -4

Thus x intercept is (-4, 0)

<em><u>Find y intercept:</u></em>

Substitute x = 0

0 + y = 4

y = 4

Thus y intercept is (0, 4)

7 0
3 years ago
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