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3 years ago

I have SAT's tomorrow and need help with math...

Mathematics

1 answer:

Brrunno [24]3 years ago

3 0

Answer:

3w + 52 ≥ 90

Step-by-step explanation:

If she volunteers 3 hours per week for w weeks, then the number of hours from tutoring is 3w. Add the 52 hours from her summer volunteering, and her total hours is 3w + 52. This needs to be at least 90 hours for her to graduate, so:

3w + 52 ≥ 90

You might be interested in

The sum of 6 times a number and 8 times another number is 12. The difference of those numbers is 9. What are the two numbers

Inga [223]

Answer:

(x,y): (6 , -3) or (-30/7 , 33/7)

Step-by-step explanation:

6x + 8y = 12

x = y + 9 or y = x+ 9

if x = y+9

6*(y+9) + 8y = 12

14y = -42

y = -3 and x = 6

if y = x+9

6x + 8*(x+9) = 12

14x = -60

x = -30/7 and y = 33/7

6 0

3 years ago

1. (8-2)+18×6= 2. (15+29-4)×4= 3. (13+5)×(13-5)= show steps please

NeX [460]

Use the order of operations (PEMDAS):

Parentheses, Exponents, Multiplication & Division, and then Addition & Subtraction

************************

1) (8 - 2) + 18 x 6

Parentheses (8 - 2)

6 + 18 x 6

Multiplication (18 x 6)

6 + 108

Addition (6 + 108)

114

**************************

2) (15 + 29 - 4) x 4

Parentheses (15 + 29 - 4)

40 x 4

Multiplication (40 x 4)

160

******************************

3) (13 + 5) x (13 - 5)

Parentheses (13 + 5) and (13 - 5)

18 x 8

Multiplication (18 x 8)

144

*********************************

Answers: 114, 160, 144

7 0

3 years ago

Write and solve a real-world problem that can be represented by the expression (-3)(5)+10.

Blizzard [7]

Hi!

$(-3)(5)+10$

$-15+10$

$=-5$

Explanation: This question is about math, and this lesson is about order of operations. I will give you a hint. You had to used PEMDAS, P-Parenthesis should be go first, E-Exponents, M-Multiply, D-Divide, A-Add, and S-Subtract. If you use multiply, divide, add, or subtract it should go left to right. First, you had to multiply and divide should go left to right. And it gave us -15+10. And finally, you should add and subtract by left to right. And it gave us -5 is correct answer. Hope this helps! Thank you for posting your question at here on Brainly. And have a great day. -Charlie

5 0

3 years ago

Determine whether each function is an example of exponential growth or decay. then find the y-intercept. y=0.01(10)^x

olya-2409 [2.1K]

To determine if it is growth or decay, you just look if the y increases or decreases as x gets bigger. in this case as x gets bigger then y gets bigger, so it is growth.

to get y intercept, plug in 0 for x.and see what y equals. so:

y = 0.01(10)^0

anything raised to the zero power is 1. so:
y = 0.01 (1)
y = 0.01

that is y intercept.

3 0

3 years ago

Which vector matrix represents the reflection of the vector <-1,5> across the line x = y

Arturiano [62]

Answer:

$V = \left[\begin{array}{ccc}5&-1\end{array}\right]$

Step-by-step explanation:

We want to reflect this 2x1 vector on the line y = x.

To make this reflection we must use the following matrix:

$R=\left[\begin{array}{cc}0&1\\1&0\\\end{array}\right]$

Where R is known as the reflection matrix on the line x = y

Now perform the product of the vector <-1,5> x R.

$\left[\begin{array}{ccc}-1\\5\end{array}\right]x\left[\begin{array}{ccc}0&1\\1&0\end{array}\right]\\\\\\\left[\begin{array}{ccc}-1(0) +5(1)&-1(1)+5(0)\end{array}\right]\\\\\\\left[\begin{array}{ccc}5&-1\end{array}\right]$

The vector matrix that represents the reflection of the vector <-1,5> across the line x = y is:

$V = \left[\begin{array}{ccc}5&-1\end{array}\right]$

6 0

4 years ago