What is 5d - 10 = 20

Answers

Answer 1

Answer:

Here is your equation:

$5d-10=20$

In this equation, you're looking for the value of d alone. That means you would have to move everything next to the variable to the other side. You can do that by doing the opposite of what's being done to it.

In this equation, 5d is being subtracted by 10(-10). The opposite of that is adding 10(+10). You would have to add 10 to both sides, since -10 and +10 cancel out each other.

The first thing you are going to do is add 10 to both sides.

$5d-10+10=20+10 \n 5d = 30$

Now you're left with the equation 5d=30. Remember that you're looking for d alone. In the current equation, d is being multiplied by 5(5d ⇒ 5 × d). Again, you're going to do the opposite of what's being done to it. The opposite of multiplying is dividing, therefore, you're going to divide both sides by 5, since the 5 divided by 5 is 1, which cancels out the 5.

Divide both sides by 5.

$(5d)/(5) =(30)/(5) \n \nd=6$

That means the answer to your equation is d = 6.

Answer 2

Answer:

Answer:

d = 6

Step-by-step explanation:

Let us follow these steps to make d the subject.

First, add 10 to both sides.

5d - 10 = 20

5d = 10+ 20

5d = 30

Divide both sides by 5.

d = 6

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Negative square root of 99

Answers

The square root of a number A is another number B, such that B x B = A. B can be either positive or negative since -B x -B = A. The square root of 99 is re-written as 3 times the square root of 11 by factoring 99 as 9 x 11. The square root of 9 x 11 is the square root of 9 times the square root of 11. The square root of 9 is 3, and thus, the final answer is 3 times the square root of 11.

9.9498743710662 is the answer

What is a+2 divided by 2 = -1?

Answers

$(a+2)/(2)=-1\ \ \ /\cdot2\n\n2\cdot(a+2)/(2)=-1\cdot2\n\na+2=-2\ \ \ /-2\n\na+2-2=-2-2\n\na=-4$

A store had a sale on art supplies. The pricep of each item was marked down 60%.
Which expression represents the new price?
A 0.4p C 1.4p
B 0.6p D 1.6p

Answers

The expression that marks the new price is choice A 0.4 p. Since we mark the prices down 60%, the customer will only be charged 40% of the p price which is 0.4 x p. Think of a candy bar that originally costs $1 and is marked down 60% by a discount sale. The new price is $0.40.

100%-60%=40%=0.4
so new price is 0.4p
Answer: A=0.4p

Can someone please help me with these question1. Leonard spent 1/4 of his money on a sandwich. He spent to time as much on a gift for his brother as on some comic books. He had 3/8 of his money left. What fraction of his money did he spend on the comic books?

2. Christine baked a pumpkin pie. She ate 1/6 of the pie. Her brother ate 1/3 of it and gave the leftovers to his friends. What fraction of the pie did he give to his friends?

3. Liang went to the bookstore. He spent 1/3 of his money on a pen and 4/7 of it on books. What fraction of his money did he have left?

Answers

1: 1/4= 2/8 3/8 - 2/8=1/8 so he spent 1/8 on the comic books. 2: answer: 2/6. 3. 1/3= 7/21 and 4/7=12/21 21-12-7=2 so 2/21

How can you tell the fraction is a unit fraction

Answers

a unit fraction is each piece of the fraction. so if you have a rectangle cut into fourth than each piece of that rectangle is 1/4. each 1/4 is a unit fraction. Unit fractions will always have one as a numerator.

A unit fraction is a rational number written as a fraction where the numerator is one & the denominator is a positive integer. A unit fraction is therefore the reciprocal of a positive integer. Examples; 1/2, 1/3, 1/4, etc.

Hope this helps & makes sense . (:

Suppose Serena invests the $2,500 for 3 years and earns $255.What was the rate of interest?

Answers

I=PRT
P for Principle Amount
R for Rate
T for Time in years

255 = 2500 × r × 3
255 = 7500 × r
Divide by 7500 on both sides to isolate r
$(255)/(7500)$ = $(7500 * r)/(7500)$
7500 and 7500 cancels out

0.034 = r
0.034 × 100 = 3.4% (to convert it as a percentage)
Rate of Interest: 3.4%

Answer:

3.4%

Step-by-step explanation:

Here, Principal= $2500

Simple Interest= $255

Time= 3 years

we have to find the rate of interest

Rate of interest= $(simple interest. 100)/( p. t)$