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2 years ago

15

Violet has taken three test with rhe score of 60,65 and 70. To get an 70 average, what must her grade be on the fourth test? Wri

te and solve an equation to find her third test score.

1 answer:

rusak2 [61]2 years ago

6 0

Answer:

85

Step-by-step explanation:

Equation-

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jamal finished 5/6 of his homework .margaret finished 3/4 and steve finised 10/12 of his homeowrk. which 2 students finished the

Blababa [14]

Jamal and Steve finished the same amount of homework because 5/6 is the same as 10/12

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3 years ago

Can someone please help me Factor 4x^2 - 81

Vsevolod [243]

Answer:

(2x-9)(2x+9)

Step-by-step explanation:

This is a difference of squares because it can be written as (2x)^2-9^2

The formula for factoring a difference of squares is a^2-b^2=(a-b)(a+b)

So replace a with 2x and b with 9 giving us

4x^2-81=(2x-9)(2x+9)

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3 years ago

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In triangle $ABC,$ point $D$ is on $\overline{AC}$ such that $AD = 3CD = 12$. If $\angle ABC = \angle BDA = 90^\circ$, then what

Neporo4naja [7]

Answer:

$BD=4\sqrt{3}\ units$

Step-by-step explanation:

we know that

$AD=12\ units$

$3CD=12$ ----> $CD=4\ units$

see the attached figure to better understand the problem

Triangles ABD and BCD are similar by AA Similarity Theorem

Remember that

If two figures are similar, then the ratio of its corresponding sides is proportional

so

$\frac{BD}{AD}=\frac{CD}{BD}$

substitute the given values

$\frac{BD}{12}=\frac{4}{BD}$

$BD^2=48$

$BD=\sqrt{48}\ units$

simplify

$BD=4\sqrt{3}\ units$

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3 years ago

The grades of a science test are normally distributed. Thanh finds that his grade on the test has a z-score of –2.5. Which state

liraira [26]

From all those aforementioned, the true statement is: Thanh’s grade is 2.5 standard deviations below the mean of the test grades.

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2 years ago

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Explain how you could use the distributive property to find how many gallons of water are pumped out of the black hole in 2 1/2

Otrada [13]

Answer:

by counting the numbers

Step-by-step explanation:

1 + 1 + 1 + 1 + 1 etc

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2 years ago