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Karo-lina-s [1.5K]
3 years ago
7

How do I solve this​

Mathematics
1 answer:
frez [133]3 years ago
4 0

Answer:

15 degrees

Step-by-step explanation:

7x - 15 = 90

    +15.   +15

7x = 105

divide both sides by 7

x = 105/7 = 15

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ABCD is a rhombus. Find AB. Enter your answer as a fraction in simplest form.
kogti [31]

Answer: 110/3

Step-by-step explanation:

5x+15= 8x+2 = 13/3

5 * 13/3 + 15= 110/3

7 0
3 years ago
Prove that: sin8A/1-cos8A=cot4A​
nikitadnepr [17]

Step-by-step explanation:

Recall the identity

\tan \frac{A}{2}= \dfrac{1 - \cos A}{\sin A}

We can see that

\dfrac{\sin 8A}{1 - \cos 8A} = \dfrac{1}{\tan 4A}= \cot 4A

8 0
3 years ago
Julian calculates the volume of a rectangular prism with the dimensions 3/4ft by 4 feet by 1/2 ft. His work is shown here.
lbvjy [14]

Answer:

He multiplied the denominators incorrectly

Step-by-step explanation:

we know that

The volume of a rectangular prism is given by the formula

V=LWH

we have

L=3/4 ft

W=5/1 ft

H=1/2

substitute

V=(3/4)(5/1)(1/2)= 3x5x1=    15

                           ₋₋₋₋₋₋₋₋    ₋₋₋₋ ft³

                           4x1x2=    8

                       

therefore

He multiplied the denominators incorrectly

7 0
2 years ago
1. A submarine is 40 meters below sea level. It goes up 12 meters, then goes down 30 meters. What is the submarine's new positio
expeople1 [14]

Answer:

58

Step-by-step explanation:

The submarine is below the sea level by 40 meters. Then, it goes up by 12. That means 40-12=28. The submarine goes 30m down again which means 28+30=58

7 0
3 years ago
A cyclist rides his bike at a speed of 21miles per hour. What is this speed in miles per minute? How many miles will the cyclist
AveGali [126]

Answer:

.35 miles per minute

3.5 miles in 10 minutes

Step-by-step explanation:

21 ÷ 60= .35

.35 × 10 = 3.5

7 0
3 years ago
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