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3 years ago

Jose made these grades on his test: 78,88,98. Without doing any computing, what is his average?

Mathematics

2 answers:

VARVARA [1.3K]3 years ago

6 0

Add all 3 and you get 264 then divide by 3 and you get 88

Ainat [17]3 years ago

3 0

The average is 88 because you have to add all the numbers up and divide by the number of numbers that you have....

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Please help ASAP please

lesantik [10]

The answer is 1 19/80 or 1.2375.

Hope this helps!

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3 years ago

Idk ;-; lol help meeeee

masha68 [24]

Step-by-step explanation:

the answer is $.75

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3 years ago

If x varies directly as y and x= 18 when y =3 find x when y=7

denpristay [2]

Answer:

Step-by-step explanation:

x = Ky

18 = K(3)

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x = 6y

x = 6(7) = 42

5 0

4 years ago

Given right triangle ABCABC with altitude \overline{BD} BD drawn to hypotenuse ACAC. If BC=10BC=10 and DC=5,DC=5, what is the le

Helen [10]

Answer: $\overline{AC}=$ 12.5

Step-by-step explanation: The triangle ABC and its altitude $\overline{BD}$ is represented in the figure below.

<u>Altitude</u> is a segment of line that link a vertex and the opposite side, forming a right angle.

So, because of $\overline{BD}$ , now we have two similar triangles, which means that ratios of corresponding sides are equal:

$\frac{\overline{BD}}{\overline{BC}} =\frac{\overline{AD}}{\overline{BD}}$

$\overline{BD}^{2}=\overline{BC}.\overline{AD}$ (1)

This is always true for a right triangle and a altitude drawn to the hypotenuse.

Triangle BDC is also right triangle. So, we can use Pythagorean theorem to determine the missing side.

$\overline{BC}^{2}=\overline{CD}^{2}+\overline{BD}^{2}$

$\overline{BD}^{2}=\overline{BC}^{2}-\overline{CD}^{2}$ (2)

Substituting (2) into (1):

$\overline{BC}^{2}-\overline{CD}^{2}=\overline{BC}.\overline{AD}$

We want to find f, so:

$\overline{AD}=\frac{\overline{BC}^{2}-\overline{CD}^{2}}{\overline{BC}}$

$f=\frac{10^{2}-5^{2}}{10}$

f = 7.5

The length of $\overline{AC}$ is

$\overline{AC}=f+5$

$\overline{AC}=7.5+5$

$\overline{AC}=12.5$

The length of the hypotenuse of triangle ABC is 12.5 units.

5 0

3 years ago

Read 2 more answers

7/8 - 1/3 simplified?

Snezhnost [94]

Answer:

13/24

Step-by-step explanation:

7/8x3=21/24

1/3x8=8/24

21-8=13/24

3 0

3 years ago

Read 2 more answers