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3 years ago

HELP WHAT STEPS DO I NEED TO DO TO SOLVE : (2+(-3)(5))(3+2(-6))

2 answers:

5 0

The order of operations is a rule that tells the correct sequence of steps for evaluating a math expression. We can remember the order using PEMDAS: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

mylen [45]3 years ago

4 0

Answer:

117

Step-by-step explanation:

(2-15)×(3-12)= -13×(-9)= 117

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Your engineering firm is asked to specify the maximum load for the elevators in a new building: Each elevator has mass 490 kg wh

steposvetlana [31]

Answer:

a) m =589.734kg

b) n = 8 people (rounded down)

Step-by-step explanation:

The first step is to calculate the maximum load after safety considerations ( $T_{max}$

Since we know that the maximum tension the cables can withstand is 19500N (or 19.5kN). To calculate ( $T_{max}$ we multiply this value by $\frac{2}{3}$ (as per the given safety consideration.

Hence

$T_{max} = \frac{2}{3} (19500) \\ T_{max} = 13000N$

a) Now to find the maximum load in kgs, we use the following formula

$(m_{0} + m)(g + a) = T_{max}$

Where

$m_{0}$ = mass of elevator

$m$ = maximum load

$g$ = acceleration due to gravity

$a$ = maximum acceleration of elevator

Inputting the values and solving

$m_{0} + m)(g + a) = T_{max}\\ (490 + m)(9.8 + 2.24) = 13000\\ 12.04m = 7100.4\\ m = 589.734kg$

Hence the maximum load is m =589.734kg

b) To find the number of people (n) we divide the value of m by 70kg

n = 589.734 / 70

n = 8.42 or 8 people

7 0

3 years ago

Iron has a density of 7.87 g/cm^3. What is the mass of a block of iron that is 2cm x 10cm x 5cm?

Rufina [12.5K]

Answer:

2x10x5

V = 100 cm3

D = 7.87 g/cm3

M = 7.87x100

= 787g

3 0

3 years ago

Devon had 3/5 of a candy bar. Gina ate ½ of it. How much of it remains?

xz_007 [3.2K]

Answer:

3/10

Step-by-step explanation:

To find how much remains, you need to find 1/2 of 3/5 which is 1/2 * 3/5. To multiply the two fractions, multiply the two numerators and multiply the two denominators to get 3/10. Thus, 3/10 of the candy bar remains.

Hope this helps :)

7 0

3 years ago

Read 2 more answers

Help. pls. i will mark brainliest.

Gelneren [198K]

Answer:

pretty sure its b.

hope this helps!

5 0

3 years ago

Read 2 more answers