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Sonbull [250]
3 years ago
5

7 – 4 (3a – 5) I NED HLP ASAP. I WILL TRY BRAINLIEST TO FIRST ANSWER. EXPLANATION ALSO NEEDED

Mathematics
1 answer:
Lina20 [59]3 years ago
6 0

The answer is a = 2.25.

Simplifying

7 + -4(3a + -5) = 0

Reorder the terms:

7 + -4(-5 + 3a) = 0

7 + (-5 * -4 + 3a * -4) = 0

7 + (20 + -12a) = 0

Combine like terms: 7 + 20 = 27

27 + -12a = 0

Solving

27 + -12a = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-27' to each side of the equation.

27 + -27 + -12a = 0 + -27

Combine like terms: 27 + -27 = 0

0 + -12a = 0 + -27

-12a = 0 + -27

Combine like terms: 0 + -27 = -27

-12a = -27

Divide each side by '-12'.

a = 2.25

Simplifying

a = 2.25

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Evaluate 5 - 4b if b = -3​
victus00 [196]

Answer:

17

Step-by-step explanation:

5-4b ; b=-3

- substitute b= -3 into the expression

5-4×(-3)

- multiply the numbers

(-4×(-3)=+12) 5+12

- add the numbers

(5+12=17)

SOLUTION: 17

4 0
3 years ago
When a number is decreased by 3% the result is 80. what was the original number?
Aleksandr [31]

Answer:

82.47

Step-by-step explanation:

.93n = 80

n = 80/.93

n = 82.47

6 0
3 years ago
Multiply (x + 1)^2<br><br> X^2+1<br> X^2x+2<br> X^2+x+1<br> X^2+2x+1
enot [183]

Answer:

x^2+2x+2

Step-by-step explanation:

(x+1)(x+1) multiply out

8 0
4 years ago
Read 2 more answers
If you invest $823 at an interest rate of 3% every 6 months, how much money will you have after 9 years
zubka84 [21]

Answer:

Step-by-step explanation:

The compounding formula for this is

A(t)=P(1+\frac{r}{n})^{nt} where A(t) is the amount after all the compounding is done, P is the initial investment, r is the interest rate as a decimal, n is the number of times the interest compounds per year, and t is the time in years.  For us, our n is 2, since the money compounds every 6 months, and 6 months goes into 1 year 2 times.  Our formula then is:

A(t)=823(1+\frac{.03}{2})^{(2)(9)} which simplifies a bit to

A(t)=823(1+.06)^{18} which simplifies a bit more to

A(t)=823(1.06)^{18}

Raise 1.06 to the power of 18 and then multiply the 2 numbers together:

A(t) = 823(2.854339153) so

A(t) = 2349.12

7 0
3 years ago
I know I’m supposed to use the formula A= L•W
EleoNora [17]

The width is given as = x cm

As length is given as= the length is 5 cm more than the width

The width of the rectangle is = x cm

So, length of the rectangle becomes= x+5 cm

4 0
3 years ago
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