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V125BC [204]
3 years ago
12

What is 5x + 9 - 2x - 7

Mathematics
1 answer:
beks73 [17]3 years ago
7 0
Answer:
3x + 2

How I Found The Answer:
5x + 9 - 2x - 7
= 5x + 9 + -2 + -7
= (5x + -2x) + (9 + -7)
= 3x + 2
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How do you factor b^2-81
Naddik [55]
The middle number is 0 and the last is -81Factoring means we want something like(b+_)(b+_)We need two numbers that add together to get and Multiply to get -81which are 9 and -9:<span><span>9+-9 = 0 and </span><span>9*-9 = -81</span></span>
Fill in the blanks in
(b+_)(b+_)
with 9 and -9 to get...<span><span>(<span>b+9</span>)</span><span>(<span>b−9</span>)</span></span>
The answer is : (b+9)(b−9)
<span>
</span>
7 0
3 years ago
consider a school which has 150 girls and 120 boys find the following ratios : girls : boys , girls : students
Oksi-84 [34.3K]


150/120 (girls to boys)

150/270 (girls to students)

those would be your ratios...hope you find it helpful :)

6 0
3 years ago
Read 2 more answers
Change the expression to a single square root, or its opposite:
aleksley [76]

Answer:

a)2\sqrt{2}=\sqrt{8}

b)-7\sqrt{3} =-\sqrt{147}

c)\frac{1}{3} \sqrt{18b}  =\sqrt{2.b}

d)5\sqrt{y} =\sqrt{25y}

e)-6\sqrt{2a}  =-\sqrt{72a}

f)-0.1\sqrt{200c}=-  \sqrt{2c

Step-by-step explanation:

a) 2\sqrt{2}=( \sqrt{2}  )^2.\sqrt{2}=(\sqrt{2})^3 = \sqrt{2^3} =\sqrt{8}

b)-7\sqrt{3} =-(\sqrt{7} )^2\sqrt{3} =-\sqrt{7^2.3} =-\sqrt{147}

c)\frac{1}{3} \sqrt{18b} =\frac{1}{3} \sqrt{9.2.b} =\frac{1}{3} \sqrt{3^2.2.b} =\frac{1}{3} \times 3\sqrt{2.b} =\sqrt{2.b}

d)5\sqrt{y} =\sqrt{5^2} \sqrt{y}=\sqrt{25y}

e)-6\sqrt{2a} =-\sqrt{6^2}\sqrt{2a}  = -\sqrt{36.2a} =-\sqrt{72a}

f)-0.1\sqrt{200c}=-\frac{1}{10}  \sqrt{10^2.2c} =-\frac{1}{10}\times10  \sqrt{2c}=-  \sqrt{2c

4 0
3 years ago
The population of bald eagles is decreasing 4% each year. In 2015, there were 2800 bald eagles.
Vladimir [108]

Answer:

1120 Eagles

Step-by-step explanation:

If the population of Eagles decreases by 4% percent each year, then in 2030 (which is 15 years later), the population would decrease by (4 × 15)%

that is 60%

This indicates that the population of bald eagles in the year 2030 would be 60% less of what it was in the year 2015.

so we have, \frac{60}{100} × 2800

which gives us 1680

this means that the number of bald eagles in the year 2030 would be 1680 less than the number of bald eagles in the year 2015

hence 2800 - 1680

then the answer is 1120 Bald Eagles

7 0
2 years ago
Read 2 more answers
RS = 3x + 17, MN = 7x - 15
Fofino [41]

Answer:

Step-by-step explanation:

RS ≡ MN

 3x + 17 = 7x - 15

- 3x          - 3x

         17 = 4x - 15

      + 15        + 15

         32 = 4x

          4      4

           8 = w

3 0
3 years ago
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