Evaluate \(2x-y\) when \(x = 5,\,\,y = 3\)

Evaluate \(4a-3c\) when \(a = 7,\,\,c = (-2)\)

Evaluate \(d^2-3ef\) when \(d = 5,\,\,e = 2,\,\,f = ( - 7)\)

Evaluate \(z^2-3z+5\) when \(z = (-9)\)

Evaluate \(\dfrac{5F-160}{9}\) when \(F=-40\)

Find the value of \(7x-3\) if \(x=4\)

Find the value of \(\dfrac{a-b}{3}\) if \(a=5,\; b=-4\)

If \(m=4\) and \(n=-2\) find \(m^2 +n\)

The formula for the area of a triangle is \(A=\dfrac{1}{2}bh\) where \(A\) is the area, \(b\) is the base length and \(h\) is the height.

Find the area of a triangle with base length \(15\mathrm{~cm}\) and height \(20\mathrm{~cm}\).

The formula for converting Celsius temperatures to Fahrenheit temperatures is \(F= \dfrac{9}{5}C+32\) where \(F\) is the temperature in Fahrenheit and \(C\) is the temperature in Celsius. Use the formula to convert \(40^{\circ}\) to Fahrenheit.

The formula for finding the circumference of a circle is given by \(C= 2\pi r\), where C is the circumference, \(\pi=\dfrac{22}{7}\) and \(r\) is the radius.

Find the circumference of a circle with a radius of \(21\mathrm{~cm}\).

Find the value of \(7x-3\) if \(x=-3\)

Find the value of \(\dfrac{a-b}{3}\) if \(a=-3, \;b=9\)

If \(m=4\) and \(n=-2\) find \(m-n^2\)