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Rudiy27
3 years ago
5

Plz help I dont understand this

Mathematics
2 answers:
damaskus [11]3 years ago
8 0

We can do this by following the order of operations  procedure.  PEMDAS.

= Parentheses Exponent Multiply Division Add Subtract

So in this case we work out the parentheses first , then the multiply:-

5(8 + 7)

= 5 * 15

= 75 (answer)




klio [65]3 years ago
7 0
The answer is 75

The first thing you need to do is do what is in the brackets. This happens to be 8+7, then you need to multiply this answer by 5.
for next time remember bedmas
Brackets
Exponents ( the small number in the top right hand corner)
Division
Multiplication
Addition
Subtraction
Though rules change when subtraction or multiplication are in front of division or addition. If so do the working from left to right (This includes multiples of brackets, exponents and such)
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HELP ME!!!
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Answer:

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Step-by-step explanation:

You can consider the area to be that of a trapezoid with parallel bases f(a) and f(4), and width (4-a). The area of that trapezoid is ...

  A = (1/2)(f(a) +f(4))(4 -a)

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We want this area to be 12, so we can substitute that value for A and solve for "a".

  12 = (1/2)(3a +10)(4 -a)

 24 = (3a +10)(4 -a) = -3a² +2a +40

  3a² -2a -16 = 0 . . . . . . subtract the right side

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Values of "a" that make these factors zero are ...

  a = 8/3, a = -2

The values of "a" that make the area under the curve equal to 12 are -2 and 8/3.

_____

<em>Alternate solution</em>

The attachment shows a solution using the numerical integration function of a graphing calculator. The area under the curve of function f(x) on the interval [a, 4] is the integral of f(x) on that interval. Perhaps confusingly, we have called that area f(a). As we have seen above, the area is a quadratic function of "a". I find it convenient to use a calculator's functions to solve problems like this where possible.

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Answer:

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3 years ago
The temperature was 14`°F`. If the temperature dropped 5 degrees every hour for 4 hours, what is the temperature after the 4 hou
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