Ten times the sum of half a number and 5 is 25.

Mathematics

1 answer:

Nezavi [6.7K]2 years ago

6 0

Answer: in algebraic expiration its 10 (1/2 + 5) = 25

Step-by-step explanation:

You might be interested in

What is the answer to all of these?

4vir4ik [10]

$810000\\
0.000621\\
3040000000\\
0.0000043\\
0.00172\\
58100000\\
0.0965\\
6083$

3 0

3 years ago

9n - 15 for n = 5 help me please

MaRussiya [10]

If n = 5, then 9n = 45

45 - 15 = 30, which is the same thing as 6n

7 0

3 years ago

The product of (3 − 4i) and____is 25.

LiRa [457]

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

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