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sergij07 [2.7K]
2 years ago
6

I need to find the area. (please help me quick & the answer and explanation plz) POINTS: 15! please give real answers!!!!

Mathematics
2 answers:
Mariulka [41]2 years ago
7 0
A=1/2+base x height hope I helped
Rufina [12.5K]2 years ago
6 0
Area of triangle= 1/2 x Base x H
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A scientist needs 10 L of a solution that is 60% acid. She has a 50% acid solution and a 90% acid solution she can mix together
sineoko [7]

Answer:

<u>The equations system is:</u>

<u>x + y = 10</u>

<u>0.5x + 0.9y = 6</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Liters of 60% acid solution needed = 10

x = Number of liters of the 50% solution

y = Number of liters of the 90% solution

2. Which equation represents the total liters of acid that are needed?

There are two equations needed:

The first one related to the total liters needed, 10 in this case:

x + y = 10

The second one related to the acid concentration of the 10 liters:

0.5x + 0.9y = 10 * 0.6

0.5x + 0.9y = 6

<u>The equations system is:</u>

<u>x + y = 10</u>

<u>0.5x + 0.9y = 6</u>

Solving for x and y in the 2nd equation, we have:

0.5 (10 - y) + 0.9y = 6

5 - 0.5y + 0.9y = 6

0.4y = 6 - 5

0.4y = 1

y = 1/0.4 = 2.5 ⇒ x = 7.5 (10 - 2.5)

The scientist can mix 7.5 liters of the 50% acid solution and 2.5 liters of the 90% acid solution to get the 10 liters of the 60% acid solution.

6 0
3 years ago
What are the zeros of x^2-5x-1
nexus9112 [7]
The zeros is another name for solutions.

x^2 - 5x - 1 = 0

You must use the quadratic formula to find x.

In the formula, a = 1, b = -5 and c = -1.

Plug into formula and solve for x.

The values of x are the zeros of the function.
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3 years ago
Easy math! 7th / 20 points
bulgar [2K]

Answer:

d

Step-by-step explanation:


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2 years ago
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Please help me out (:
Murrr4er [49]

Answer:

Choice C

Y = (3)(9)^x

Step-by-step explanation:

The standard form for an exponential function is y = ab^x.

Where a is the initial value, and b is the exponential growth or decay.

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2 years ago
Ben paid $45 for an old guitar he cleaned the guitar, then resold it after marking the price 15% he used 36% of the money he got
andrey2020 [161]

Answer:it’s $18.63

Step-by-step explanation:

($45+.15($45)).36

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