Explain why this statement is true:

7a + 4 - 2a = 7a + (-20) + 4

A baker wants to sell 100 muffins. So far the baker has sold 48 corn muffins and 42 bran muffins. How many more muffins does the baker needs to sell?

A rectangle has side lengths of (2x-5) meters and (2x+6) meters. Write a linear expression in simplest form to represent the perimeter. Find the perimeter if the value of x is 12 meters

What are the prime numbers between 20 and 70

If the speed of light is 3*10^8m/s, calculate the frequency of the light if the wavelength is 7.80*10^-7?

Evaluate each expression for the value given t-14 for t=27

Lenora is a college student with a student loan of $7,500. Her tuition is $3,200 per year. She owns $470 worth of text books and a has a laptop computer worth $950. She also has a meal plan at school for which she pays $250 per month.

Solve the linear system of equations using addition. Graph the equations to verify your solution. - 4x=y+3 y = - 4 x - 3

Each costume needs 46 cm oc red ribbon and 3 times as much in yellow ribbon. What is thevtotal length of ribbon needed for 64 costumes? Ecpress yohr answer in meters.

Choose all the factors of 12. (Check all that apply.) 1 2 3 4 5 6 7 8 9 10 11 12

How do you show work for this problem? Bananas are $ 0.59/pound a. What is the constant of proportionality? b. How much does 25 pounds of bananas cost?