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ozzi
3 years ago
15

PLEASE HELP !!! help me solve 7th grade math

Mathematics
1 answer:
densk [106]3 years ago
7 0

Answer:

x=6

Step-by-step explanation:

5x-10=2x+8

subtract 2x on both sides

3x-10=8

add 10 on both sides

3x=18

x=6

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The height of a triangle is 3cm less than twice the base. The area is 10cm2
Kamila [148]

Answer:

The base is 4cm and the height is 5cm.

Step-by-step explanation:

This is a solve the system question. Call H the height of the triangle and B the base. The question tells us:

H=2B-3

and

\frac{B \times H}{2}=10

Sub the first equation into the second (as H is already isolated). You will end up with a quadratic equation - solve that any way you wish (e.g. quadratic formula). I've provided the factored form below which shows you the roots:

\frac{B(2B-3)}{2}=10\\\frac{2B^2-3B}{2}=10\\2B^2-3B=20\\2B^2-3B-20=0\\(2B+5)(B-4)=0\\B= - \frac{5}{2},4

In this question, we take B=4. You can't have a negative side length so the other answer is eliminated. Now sub the value for B into either of the original equations. I'll use the first, again because H is already isolated:

H=2(4)-3\\H=8-3\\H=5

3 0
2 years ago
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Verdich [7]

Answer:

Here use this to help you

Step-by-step explanation:

https://www.geteasysolution.com/4+8x+2.2-10x=

8 0
2 years ago
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a number when on the to the nearest 10 is equal to 50 the same number one on the to the nearest hundred is 100​
Alexxandr [17]

Answer:

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Step-by-step explanation:

6 0
2 years ago
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dolphi86 [110]

Answer:

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Step-by-step explanation:

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Verdich [7]

Answer: 1. X+2

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Step-by-step explanation:

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3. 2x+7-4x-8. 7-8=-1. 2x-4x=-2x. So it would be -2x-1.

4. (4+3)x+2x-5. Do the operation in the parenthesis first. Then it would be (7)x or just 7x+2x-5. Simplify to 9x-5.

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2 years ago
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