How can you use the properties of operations to evaluate this expression? 18 + 4(28)

Mathematics

2 answers:

nirvana33 [79]3 years ago

6 0

Answer:

Well on of the properties states that unless there are parenthesis, you multiply and divide first then you add and subtract. So, first we multiply 28*4 and that leaves use with 112, now if there is no more multiplication, division, or parentheses, and there's not. We can continue all we do is add 18+112 and we get our answer of 130.

vekshin13 years ago

5 0

Answer: Use the distributive property and expand 28, then distribute the 4 to 20 and the 4 to 8. Then you have 18 + 80 + 32. Use commutative property to reverse the order of 32 and 80 so that 18 and 32 are friendly numbers to add.

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Solve for b1 from the formula: A=1/2h(b1+b2)

Andrews [41]

Answer:

$B1 = \frac{2A-(h*B2)}{h}$

$B1=\frac{2A}{h} - B2$

Step-by-step explanation:

FOIL

(1/2)h*B1+ (1/2)h*B2=A

subtract the B2 term

(1/2)h*B1 = A- (1/2)h*B2

multiply by 2

h*B1 = 2A - h*B2

divide by h

$B1 = \frac{2A-(h*B2)}{h}$

$B1=\frac{2A}{h} - B2$

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