Help me please I. Need help is this right?

Mathematics

2 answers:

Lemur [1.5K]3 years ago

8 0

Answer:

Actually, The answer is not A. The answer is B. 3/4 hour.

Step-by-step explanation:

You want to find what half of 1 1/2 hours is. So you will need to do 1 1/2 divided by 2. This gives you 3/4. To check your work, you can also multiply 1 1/2 by 1/2 because of means to multiply. See? (Half OF 1 1/2) This will also give you 3/4

Alex73 [517]3 years ago

4 0

it’s b 3/4 hours because when you split 1 1/2 in half it’s like if you split 150 into 75

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The product of (3 − 4i) and____is 25.

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$(3-4i)(a+bi)=25\qquad\text{use FOIL method}\\\\(3)(a)+(3bi)+(-4i)(a)+(-4i)(bi)=25+0i\\\\3a+3bi-4ai-4bi^2=25+0i\\\\3a+3bi-4ai-4b(-1)=25+0i\\\\3a+3bi-4ai+4b=25+0i\\\\(3a+4b)+(3b-4a)i=25+0i\\.\qquad\qquad\qquad\qquad\Downarrow\\\\3a+4b=25\ and\ 3b-4a=0\\\\3b-4a=0\qquad\text{add 4a to both sides}\\\\3b=4a\qquad\text{divide both sides by 3}\\\\b=\dfrac{4}{3}a\qquad\text{substitute it to the first equation}\\\\3a+4\left(\dfrac{4}{3}a\right)=25\\\\3a+\dfrac{16}{3}a=25\qquad\text{multiply both sides by 3}$

$9a+16a=75\\\\25a=75\qquad\text{divide both sides by 25}\\\\\boxed{a=3}\qquad\text{put the value of a to}\ b=\dfrac{4}{3}a:\\\\b=\dfrac{4}{3}(3)\\\\\boxed{b=4}\\\\Answer:\ \boxed{(3-4i)\underline{(3+4i)}=25}$