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3 years ago

What is 13 x 7? Show your work!

Mathematics

2 answers:

Olin [163]3 years ago

8 0

Answer:

Step-by-step explanation:

This is the answer, I took a pic of the work

jeka57 [31]3 years ago

4 0

Answer:

Step-by-step explanation:

13x

-------

9 1

7 X 3 = 21

7×1 =7

7+2 =8

8+1 = 9

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BRAINLIEST IF CORRECT Historians estimate that there were about 7 million people on earth in 4,000 BCE. Now there are about 7 bi

tamaranim1 [39]

Answer:

100 times more

Step-by-step explanation:

if you multiply 7,000,000 by 1000 you get 7,000,000,000

7 0

3 years ago

Find the cos A and tan B to four decimal places. URGENT

Nikolay [14]

cos A is 0.8511 and tan B is 1.6

Step-by-step explanation:

Find the 3rd length or the hypotenuse.

Pythagoras theorem

$hypotenuse^{2}$ = $adjacent^{2}$ + $opposite^{2}$

$hypotenuse^{2}$ = $8^{2}$ + $5^{2}$

$hypotenuse^{2}$ = 64 + 25

hypotenuse = $\sqrt{89}$

hypotenuse = 9.4

a) Cos A

Data:

Adjacent = 8

Hypotenuse = 9.4

Formula:

Cos (Angle) = $\frac{adjacent}{hypotenuse}$

Cos A = $\frac{8}{9.4}$

Cos A = 0.8511

A = $cos^{-1}$ (0.8511)

A = 31.7°

b) Tan B

Data:

Opposite = 8

Adjacent = 5

Formula:

Tan (Angle) = $\frac{opposite}{adjacent}$

Tan B = $\frac{8}{5}$

Tan B = 1.6

B = $cos^{-1}$ (1.6)

B = 58°

Therefore, cos A is 0.8511 and tan B is 1.6.

Keyword: cos, tan

Learn more about cos at

#LearnwithBrainly

3 0

3 years ago

Use words to describe what a variable is

Svet_ta [14]

Answer:“A variable is a quantity that may change within the context of a mathematical problem or experiment.” Examples of variables are x, e, and q. In the expression, 5 + X =8, X is the variable.

Step-by-step explanation: I hope you found this helpful.

5 0

3 years ago

(30a^2 -11a+15)(5a-6)^-1

denis-greek [22]

$(30a^2-11a+15)(5a-6)^{-1}= (30a^2-11a+15)/(5a-6)\(5a-6)(6a+5)/(5a-6)\6a+5$

The final simplified answer is 6a + 5.

4 0

3 years ago

What is the area of the sector of the circle below, if the radius is 5 m. and the central angle < AOB measures 88 °. (round a

MariettaO [177]

Answer:

b 19.2

Step-by-step explanation:

a = $\pi$ $r^{2}$ for a circle. We do not want to find the area for a whole circle. We only want to find the area for part of a circle. a hole circle is 360 degrees.

a = $\frac{88}{360}$ $\pi$ $r^{2}$

a = $\frac{88}{360}$ $\pi$ ( $5^{2}$ )

a = 19.2 rounded.

8 0

2 years ago

Read 2 more answers